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    * Skype *


    (Wikipedia) - Skype This article is about the instant messaging client. For the company which develops it, see Skype Technologies. Skype Original author(s) Developer(s) Initial release Stable release Written in Operating system Available in Type License Website
    Screenshot of Skype 6.2 on Windows 7
    Priit Kasesalu, Jaan Tallinn
    Skype Technologies S.A. (Microsoft Corporation)
    August 2003; 11 years ago (2003-08)
      List of releases

    Windows desktop (6 October 2014; 7 days ago (2014-10-06))

    modern Windows 3.1 (12 August 2014; 2 months ago (2014-08-12))

    Mac (9 October 2014; 4 days ago (2014-10-09))

    Linux (18 June 2014; 3 months ago (2014-06-18))

    Windows Phone (10 September 2014; 33 days ago (2014-09-10))

    iPhone 5.5 (22 September 2014; 21 days ago (2014-09-22))

    iPad 4.18.1 (18 September 2014; 25 days ago (2014-09-18))

    Android (22 September 2014; 21 days ago (2014-09-22))

    BlackBerry 4.9.507.46973 (11 June 2014; 4 months ago (2014-06-11))

    Xbox One 1.8 (3 September 2014; 40 days ago (2014-09-03))

    Delphi, Objective-C, C++ with Qt
    Windows, Windows Phone 8, OS X, iOS, Linux, Android, BlackBerry 10, BlackBerry OS, Symbian, PSP, PSVita, Xbox One, Fire Phone
    38 languages
    VoIP, Instant messaging, Videoconferencing
    Freemium (Adware)
    Part of a series on
    • Skype Technologies
    • Features of Skype
    • Skype protocol
    • Skype security
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    Skype /ˈskaɪp/ specializes in providing video chat and voice calls from computers, tablets and mobile devices via the Internet to other devices or telephones/smartphones. Users can also send instant messages, exchange files and images, send video messages and create conference calls. Skype is available to download onto computers running Microsoft Windows, Mac or Linux, as well as Android, Blackberry, iOS and Windows Phone smartphones and tablets. Much of the service is free but users require Skype Credit or a subscription to call landline or mobile numbers. Skype is based on a freemium model.

    First released in August 2003, Skype was created by Dane Janus Friis and Swede Niklas Zennström in cooperation with Estonians Ahti Heinla, Priit Kasesalu, and Jaan Tallinn, who developed the backend which was also used in music-sharing application Kazaa. In September 2005, eBay acquired Skype for $2.6 billion. In September 2009, Silver Lake, Andreessen Horowitz and the Canada Pension Plan Investment Board announced the acquisition of 65% of Skype for $1.9 billion from eBay, valuing the business at $2.75 billion. Skype was later acquired by Microsoft in May 2011 for $8.5 billion. Microsoft''s Skype division headquarters are in Luxembourg, but most of the development team and 44% of the overall employees of the division are still situated in Tallinn and Tartu, Estonia.

    Skype allows users to communicate by voice using a microphone, video by using a webcam, and instant messaging over the Internet. Skype-to-Skype calls to other users are free of charge, while calls to landline telephones and mobile phones (over traditional telephone networks) are charged via a debit-based user account system called Skype Credit.

    Unlike most other VoIP services, Skype is a hybrid peer-to-peer and client–server system. It makes use of background processing on computers running Skype software, and this is reflected in Skype''s original proposed name of Sky Peer-to-Peer.

    Some network administrators have banned Skype on corporate, government, home and education networks, citing reasons such as inappropriate usage of resources, excessive bandwidth usage, and security concerns.

    Competitors include SIP and H.323-based services, such as Linphone, Google Hangouts and Viber.


    History Main article: Skype Technologies

    Skype was founded in 2003 by Janus Friis from Denmark and Niklas Zennström from Sweden. The Skype software was created by the Estonians Ahti Heinla, Priit Kasesalu, and Jaan Tallinn The first public beta version was released on 29 August 2003.

    In June 2005, Skype entered into an agreement with the Polish web portal Onet.pl. On 12 September 2005, eBay Inc. agreed to acquire Luxembourg-based Skype Technologies SA for approximately US$2.5 billion in up-front cash and eBay stock, plus potential performance-based consideration.

    On 1 September 2009, it was announced that eBay was selling 65% of Skype to Silver Lake, Andreessen Horowitz and the Canada Pension Plan Investment Board for US$1.9 billion, valuing Skype at US$2.75 billion.

    Microsoft acquisition

    On 10 May 2011, Microsoft Corporation acquired Skype Communications, S.à r.l for US$8.5 billion. The company was incorporated as a division of Microsoft, and Microsoft acquired all of the company''s technologies with the purchase. This was completed on 13 October 2011.

    Microsoft phased out its long-standing Windows Live Messenger instant messaging service in favour of Skype, although Messenger continues in mainland China. Microsoft began this transition on 8 April 2013, and completed the move by 30 April of the same year.

    Features Main article: Features of Skype

    Registered users of Skype are identified by a unique Skype Name, and may be listed in the Skype directory. Skype allows these registered users to communicate through both instant messaging and voice chat. Voice chat allows telephone calls between pairs of users and conference calling, and uses a proprietary audio codec. Skype''s text chat client allows group chats, emoticons, storing chat history and editing of previous messages. Offline messages were implemented in a beta of version 5, but removed after a few weeks without notification. The usual features familiar to instant messaging users—user profiles, online status indicators, and so on—are also included.

    The Online Number, a.k.a. SkypeIn, service allows Skype users to receive calls on their computers dialed by conventional phone subscribers to a local Skype phone number; local numbers are available for Australia, Belgium, Brazil, Chile, Colombia, Denmark, the Dominican Republic, Estonia, Finland, France, Germany, Hong Kong, Hungary, Ireland, Japan, Mexico, Nepal, New Zealand, Poland, Romania, South Africa, South Korea, Sweden, Switzerland, Turkey, the Netherlands, the United Kingdom, and the United States. A Skype user can have local numbers in any of these countries, with calls to the number charged at the same rate as calls to fixed lines in the country. The countries on this growing list are referred to collectively as the SkypeIn Countries.

    Skype supports conference calls, video chats and screen sharing between 25 people at a time for free.

    Skype does not provide the ability to call emergency numbers such as 112 in Europe, 911 in North America, 100 Call Police in India and Nepal. However, as of December 2012 there is limited support for emergency calls in the United Kingdom, Australia, Denmark and Finland. The U.S. Federal Communications Commission (FCC) has ruled that, for the purposes of section 255 of the Telecommunications Act, Skype is not an "interconnected VoIP provider". As a result, the U.S. National Emergency Number Association recommends that all VoIP users have an analog line available as a backup.

    On 14 July 2011, Skype partnered with Comcast to bring its video chat service to Comcast subscribers via their HDTV sets.

    On 17 June 2013, Skype released a free video messaging service which can be operated on Windows and Mac OS, iOS, Android and BlackBerry.

    On 12 August 2013, Skype released the 4.10 update to the app for Apple iPhone and iPad that allows HD quality video for iPhone 5 and fourth generation iPads.

    Usage and traffic
    This section is outdated. Please update this article to reflect recent events or newly available information. (February 2012)
    Usage and traffic Date Total user accounts (millions) Active users, daily use (millions) Skype to Skype minutes (billions) SkypeOut minutes (billions) Revenue USD (millions)
    Q4 2005 74.7 10.8 N/A N/A N/A
    Q1 2006 94.6 15.2 6.9 0.7 35
    Q2 2006 113.1 16.6 7.1 0.8 44
    Q3 2006 135.9 18.7 6.6 1.1 50
    Q4 2006 171.2 21.2 7.6 1.5 66
    Q1 2007 195.5 23.2 7.7 1.3 79
    Q2 2007 219.6 23.9 7.1 1.3 90
    Q3 2007 245.7 24.2 6.1 1.4 98
    Q4 2007 276.3 27.0 11.9 1.6 115
    Q1 2008 309.3 31.3 14.2 1.7 126
    Q2 2008 338.2 32.0 14.8 1.9 136
    Q3 2008 370 33.7 16.0 2.2 143
    Q4 2008 405 36.5 20.5 2.6 145
    Q1 2009 443 42.2 23.6 2.9 153
    Q2 2009 483 ? 25.5 3.0 170
    Q3 2009 521 ? 27.7 3.1 185
    Q4 2009 560 ? 36.1 ? ?
    Q1 2010 ? ? 190 12.8 860
    Q2 2010 ? ? ? ? ?
    Q3 2010 ? ? ? ? ?
    Q4 2010 ? ? ? ? ?
    Q1 2011 ? ? ? ? ?
    Q2 2011 ? ? ? ? ?
    Q3 2011 663 ? ? ? ?
    Q4 2011 ? ? ? ? ?
    Q1 2012 ? ? ? ? ?
    Q2 2012 ? ? ? ? ?

    Users may have more than one account; it is not possible to count users, only accounts.

    The volume of international traffic routed via Skype is significant. It has become the largest international voice carrier (by minutes of calls).

    Year International call market share
    2005 2.9 %
    2006 4.4 %
    2008 8 %
    2009 12 %
    2010 13 %
    2012 33 %
    2013 36 %
    2014 40 %

    In January 2011, after the release of video calling on the Skype client for iPhone, Skype reached a record 27 million simultaneous online users. This record was broken with 29 million simultaneous online users on 21 February 2011, and again on 28 March 2011 with 30 million online users. On 25 February 2012, Skype announced that it has over 32 million users for the first time ever. By 5 March 2012, it had 36 million simultaneous online users and less than a year later, on 21 January 2013, Skype had more than 50 million concurrent users online. In June 2012, Skype had surpassed 70 million downloads on an Android Device.

    On 19 July 2012, Microsoft announced that Skype users had logged 115 billion minutes of calls over the quarter, up 50% since the last quarter.

    On 15 January 2014, it was announced that Skype''s international traffic volume was continuing to grow even more. TeleGeography has estimated that Skype to Skype international traffic has gone up to 36% in 2013 to a staggering 214 billion minutes.

    System and software Client applications and devices

    Skype runs on a number of platforms including Microsoft Windows (XP, Vista, 7, 8), OS X (10.6 or newer), Linux (Ubuntu and others), Android, BlackBerry 10, iOS, Symbian and Windows Phone 8.

    On 29 October 2007, Skype launched its own mobile phone under the brand name 3 Skypephone, which runs a BREW OS.

    Skype also offers a Skype Wi-Fi Phone, which is a wireless mobile phone that allows users to make Skype calls, using a wireless Internet connection. The Skype Wi-Fi Phone has an on-screen menu that lets Skype users see who is online and available to talk, similar to what is seen on a PC. It can also be used to talk with non-Skype users. SkypeOut minutes can be used to call any phone for a low price and no monthly fee. The Skype Wi-Fi phone does not contain a web browser and so can not access hotspots that require web-based login or authentication.

    Other platforms officially supported include:

    Third-party developers, such as Truphone, Nimbuzz and Fring, previously allowed Skype to run in parallel with several other competing VoIP/IM networks (Truphone and Nimbuzz provide TruphoneOut and NimbuzzOut as a competing paid service) in any Symbian or Java environment. Nimbuzz made Skype available to BlackBerry users and Fring provided mobile video calling over Skype as well as support for the Android platform. Skype disabled Fring users from accessing Skype in July 2010. Nimbuzz discontinued support on request of Skype in October 2010.

    Before and during the Microsoft acquisition, Skype withdrew licensing from several third parties producing software and hardware compatible with Skype. The Skype for Asterisk product from Digium was withdrawn as "no longer available for sale". The Senao SN358+ long-range (10–15 km) cordless phone were discontinued due to loss of licenses to participate in the Skype network as peers. In combination these two products made it possible to create roaming cordless mesh networks with robust handoff.

    Protocol Main article: Skype protocol

    Skype uses a proprietary Internet telephony (VoIP) network called the Skype protocol. The protocol has not been made publicly available by Skype and official applications using the protocol are closed-source. Part of the Skype technology relies on the Global Index P2P protocol belonging to the Joltid Ltd. corporation. The main difference between Skype and standard VoIP clients is that Skype operates on a peer-to-peer model (originally based on the Kazaa software), rather than the more usual client–server model (note that the very popular SIP model of VoIP is also peer-to-peer, but implementation generally requires registration with a server, as does Skype).

    As far as networking stack support is concerned, Skype only supports the IPv4 protocol. It lacks support for the next generation Internet protocol, IPv6.

    Protocol detection and control

    Many networking and security companies claim to detect and control Skype''s protocol for enterprise and carrier applications. While the specific detection methods used by these companies are often private, Pearson''s chi-squared test and Naive Bayes classification are two approaches that were published in 2008. Combining statistical measurements of payload properties (such as byte frequencies and initial byte sequences) as well as flow properties (like packet sizes and packet directions) has also shown to be an effective method for identifying Skype''s TCP- and UDP-based protocols.

    Audio codecs

    G.729 and SVOPC. Skype added a Skype-created codec called SILK to Skype 4.0 for Windows and other Skype clients. SILK is intended to be "lightweight and embeddable". Additionally, Skype has released Opus, and an open source codec which integrates the SILK codec principles for voice transmission with the CELT codec principles for higher quality audio transmissions such as live music performances. Opus was submitted to the Internet Engineering Task Force (IETF) in September 2010. Since then it has been standardized as RFC 6716

    Video codecs

    VP7 is used for versions prior to Skype 5.5

    As of version 5.7 VP8 is used for both group and one on one standard definition video chat and H.264 is used for 720p and 1080p high definition group and one on one video chat.

    Release history Windows

    On 20 June 2014, Microsoft announced plans to retire Skype for Windows Desktop running version 6.13 or below, the move was completed on 8 August 2014 and all users running Skype 6.13 or earlier were signed out of Skype and could not sign back in.

    Windows Version History   Color Meaning
    Red Release no longer supported
    Green Release still supported
    Blue Future release
    Version Release Date Features/description 15 November 2007 ? 15 December 2007 ? 19 November 2008 Most popular old version. Best for older PC''s 13 February 2009 ? 13 March 2009 ? 20 March 2009 ? 3 April 2009 ? 22 April 2009 ? 3 June 2009 ? 30 June 2009 ? 25 July 2009 ? 3 September 2009 ? 12 October 2009 ? 25 February 2010 Features removed: Removed PC speaker ring support. Not officially announced. 10 March 2010 ? 8 April 2010 ? 27 April 2010 Hotfix 10 May 2010 Hotfix 20 May 2010 Skype crashed with some web-cameras when video calling, for example with Microsoft Lifecam Show and HP Elite Autofocus web-cam. 6 September 2010 Fixes issues 14 October 2010 Group video calling (beta)
    • Skype Home
    • Integration with Facebook
    • Offline instant messaging
    • New contact search and improved contact adding
    • Enhanced call quality experience
    • User interface refresh 14 December 2010 Call Phones

    Skype crashed on Call Phones area when user had more than one recently expired subscriptions

    • Contact requests sent from Skype for Windows in Cyrillic letters were shown as "?" marks on incoming contact request view on Skype for Android
    • Skype crashed on login for users who had two or more dots ("..") in their username in row.
    • Full screen sharing selection was not updated when selecting second monitor for screen sharing
    • Fixed the issues with Freetalk Everyman webcam and FaceVsion Touchcam N1 not going into HD video calling mode. Note! Camera firmware needs to be upgraded as well, see instructions for Freetalk and FaceVsion. 6 January 2011 Video calls now start by default in 640x480 resolution
    • Video calls on powerful computers start in 30 frames per second
    • Improved surfacing of ''Add Contact'' and ''Create a Group'' functions
    • Group video calling out of Beta 31 January 2011 Hotfix 15 March 2011 Modified call phones dialog with integrated contact number search
    • New presence-aware call button, including a drop-down of associated contact numbers
    • Modified presence icons, to better indicate a contact''s availability status
    • Improved call handling when you run out of credit
    • New simple button to share files and contacts
    • Improvements to help you find active calls
    • New look for the contact profile area 7 April 2011 Improved quality of video received from Skype on mobile devices
    • Skype shows users'' presence icons on collapsed contact profile cards
    • Conversation topic editing button is now always available on the conversation header
    • If a phone number is added to a profile after a failed call attempt, Skype starts a call automatically
    • Automatically switch to SMS entry after user adds mobile phone number to profile after failing to send SMS due to lack of phone number 20 April 2011 Hotfix 24 May 2011 Hotfix 26 May 2011 Hotfix 16 June 2011 Removes Skype Extras manager 28 July 2011 Skype to Facebook instant messaging
    • New and updated emoticons
    • New login experience
    • Improved call controls
    • Improved video calling reliability
    • Simplified installer flow
    • Avatar selection improved
    • Video snapshot capture improvements
    • Changed group conversations profile area
    • Plus several bug fixes 2 August 2011 Hotfix 23 August 2011 Hotfix 1 September 2011 Hotfix 13 September 2011 Introduced Microsoft Windows 8 support 29 September 2011 Updated Skype Click to Call browser plugins
    • Fixed Skype home popping up on compact mode 13 October 2011 Removed Google product bundling
    • Added attribution of used third party software 29 September 2011 Screen sharing improvements
    • New ''getting started'' experience
    • Small changes to the call controls
    • The ''Call Phones'' button has been moved
    • Updated ''Click to Call'' browser plugins
    • In call advertising
    • Skype Home'' UI improvements in compact mode 13 October 2011 Removed Google product bundling
    • Added attribution of used third party software 2 February 2012 Full HD video-calling
    • Support for Facebook audio and video-calling (beta)
    • Group screen sharing
    • Hide offline Facebook contacts
    • Push to Talk
    • Skype updater service
    • Bing Bar integration 21 February 2012 Hotfix 6 March 2012 Hotfix 12 April 2012 A new confirmation message when sending a contact to a group conversation
    • A new Hotkey for taking snapshots during video calls
    • Improved non-standard international phone number recognition for Australian users
    • The ability to opt-out from silent updates 7 May 2012 Hotfix 7 June 2012 Hotfix for Windows 8 release preview 14 June 2012 Select and pin your favorite contacts
    • Facebook and Skype contacts combined into one Contacts list
    • Easier to understand premium subscription notices
    • Possibility to control Skype video rendering technology for backward compatibility for people who have trouble with video calls 5 July 2012 Hotfix 17 July 2012 Hotfix 14 October 2012 New design. Six new language packs. Integration with Microsoft accounts (Messenger, Hotmail and Outlook.com). 10 January 2013 Integration with Microsoft Outlook to allow initiation of a call or message from within Outlook. New ''add contact'' interface. New profile design. 13 February 2013 New top toolbar with all major actions together in one place. Send eGift to friend who has a birthday. Added option to send IM with ctrl+enter. Computers with Intel Pentium III or similar CPUs, which do not support SSE2 instructions, no longer supports video calls. 14 March 2013 Maintenance release. 16:9 video ratio is now enforced, resulting in a loss in field of view and resolution when using 4:3 webcams. Features removed: No longer possible for a user to edit another user''s message regardless of admin status. Not officially announced. 5 June 2013 Improved video, simplified way to add contacts, bug fixes. 7 July 2013 Optimizations to the video messaging experience 14 October 2013 Performance improvements and fixes issues connection to Facebook problems 31 October 2013 New design log-in,Video call library upgrade, Performance improvements and fixes. 14 November 2013 Performance improvements and fixes. 22 January 2014 Fixes high processor usage with users using Chrome as their default browser. Addressed a few other bugs including enhanced stability during both group video call and in High DPI mode. 9 April 2014 New interface for the conversation window. 13 May 2014 Fixed blocked contacts appearing in Skype Home, no input fields in login Window and crash when chat name contains "&#" characters. 9 July 2014 Fixed bugs:
    • Import contacts from Facebook showing empty for some users.
    • Further sign in screen improvements to prevent it empty/blank.
    • Messages showing wrong timestamp.
    • There was a confusing message about group video being enabled because a participant has Skype Premium. We removed this as group video calls are free for everyone for a while now.
    • More stability improvements based on the feedback and reports from you here on the community.
    OS XOS X Version History  
    The factual accuracy of parts of this article (those related to table) may be compromised due to out-of-date information. Please update this article to reflect recent events or newly available information. (January 2013)
    Color Meaning
    Red Release no longer supported
    Green Release still supported
    Blue Future release
    Version Release Date Features/description 19 February 2006
    • improvement: minor cosmetic changes
    • improvement: more fully localized to Japanese
    • bugfix: calls directed to voicemail sometimes caused glitches in the call drawer 5 July 2006 Known issue: Users who created their account on Intel-based computers will not be able to revert to earlier versions of Skype, after they have installed Skype
    • new feature: Universal binary: Skype is now made to run natively on both Intel- and PowerPC-based Mac computers
    • new feature: Web presence: Show your Skype status on the web and in your email signature
    • new language: Traditional Chinese 26 October 2006 Make video calls to anyone on Skype, no matter what kind of computer they are using. 30 January 2007 ? 11 April 2007
    • Improved audio quality.
    • Transfer calls to your Skype contacts 16 May 2007 A new call-transfer feature that is exclusive to the Mac platform. Users can now select More > Call Transfer to transfer an ongoing call to another Skype user on their contact list.
    • Join public chats
    • Chat typing indicator: see when others are writing a message
    • Skype Prime: call a premium-service provider and pay for their advice and knowledge with Skype credit
    • Automatic updates: get new features and updates without having to go to Skype''s website DTMF tones for automatic answering services available also during Skype-to-Skype calls 22 May 2007
    • bugfix: USB/Bluetooth Audio update
    • bugfix: Localization fixes
    • bugfix: renamed ''Rename...'' to ''Edit Contact...'' for SkypeOut contacts
    • bugfix: fixed deleting header files from Skype framework
    • bugfix: fixed crash after forced upgrade 13 June 2007 all localizations updated
    • improvement: Skype''s own audio codec
    • improvement: Skype improved conference mixer
    • improvement: Skype Jitter Buffer and concealment
    • improvement: Skype audio preprocessing components
    • bugfix: fixed application hangup on handling certain URL links in chat messages
    • bugfix: fixed exception (resulting in disappearance of message) on handling certain intentionally constructed "bad" chat messages
    • bugfix: privacy policy fix, not accepting multichats from non-authorized users 17 July 2007 ? 27 November 2007 ? 30 November 2007 German, Spanish, French, Dutch, Japanese, Russian, Norwegian, Italian, Czech localizations updated
    • feature: Higher resolution video calls (640×480 and 25 frames per second)
    • feature: Mobile Indicators
    • improvement: Possibility to paste DTMF codes to call window
    • improvement: Added confirmation dialog before closing all open chats
    • improvement: selected chat background color in drawer is now gray if Skype is inactive
    • improvement: Joining public chat when host is offline has improved messaging
    • improvement: clicking search button in the view, which is shown after quickfiltering starts search immediately
    • improvement: "Block" and "Add to Conference" menu items were not enabled when multiple contacts were selected in contact list
    • improvement: Added "Back to Contacts" button to the view, which is shown after quickfiltering didn''t find anything
    • improvement: KICKED and KICKBAN messages now shown in chat
    • improvement: Volume slider in conference calls and video calls
    • improvement: Improved context menu of contact groups
    • improvement: Rename contact group right after creation
    • improvement: Address Book contacts are now updated after change in Address Book
    • improvement: context menus of Address Book contacts improved
    • improvement: File transfer notifing window improved
    • improvement: Added "Create New Group" menu item to the "Add to Group" submenu in the context menu of contact list
    • change: Growl removed from advanced prefs
    • change: Renamed ''Show Skype status in menu bar'' to ''Show status in menu bar''and moved to General
    • bugfix: Skype did not install Address Book dialler on some instances
    • bugfix: Compatibility with Leopard OSX 10.5 firewall
    • bugfix: Removed 3 seconds delay after hanging up a video call
    • bugfix: When sending contacts to multiple users comma appeared between user
    • bugfix: Sound popup menu was not updated after removing custom sound
    • bugfix: Video calls were unstable on PowerPC computers
    • bugfix: Kick chat messages was displayed incorrectly
    • bugfix: Crash on quitting with Cmd+Q before user is signed in
    • bugfix: "About Skype" window did not close when the logo was clicked
    • bugfix: It was not possible to send voicemails after cancelling a voicemail recording right after it started
    • bugfix: Number of missed events were wrong sometimes after marking new voicemails
    • bugfix: Sometimes contact list was not fully visible or there was some white space inside the main window
    • bugfix: Sometimes echo123 was not added to the contact list for the new users signing in first time
    • bugfix: Skype crashed during processing transfer history for File Transfer window
    • bugfix: Sometimes Skype crashed when stopping video
    • bugfix: File Transfer didn''t show correct file size during transfer
    • bugfix: Local video was not shown on some cases
    • bugfix: Search button in Find Contact was disabled
    • bugfix: It was possible to import duplicate phone numbers
    • bugfix: It was not possible to accept file transfer after Skype client restart
    • bugfix: Multichat participants list was wrongly sorted
    • bugfix: There was no call window on receiver side, if caller hung up and called again very quickly
    • bugfix: If someone came online while renaming a contact the whole contact name got selected
    • bugfix: Contact groups were sometimes expanded automatically when internet connection status changed
    • bugfix: Busy signal kept playing while waiting for redial
    • bugfix: Chats did not open sometimes on Panther OSX 10.3.9
    • bugfix: Reseting language in edit profile window did not work
    • bugfix: Sometimes Skype played dual ringtones when making a SkypeOut call
    • bugfix: It was not possible to transfer call back to the person who transferred it to you
    • bugfix: Wrong chat was selected in drawer after closing all read
    • bugfix: When adding Address Book contact to Skype contact list some details were not added to contact list
    • bugfix: Sometimes Skype froze while loading contactlist right after sign-in
    • bugfix: Conference call view didn''t transform back into single call view, when only one participant was left in the call
    • bugfix: Full screen video didn''t clear when joining a conference call
    • bugfix: Long URL''s were overdrawn in view profile window
    • bugfix: When already in a call, and ''automatically answer calls'' selected – current call was placed on hold and incoming call was answered
    • bugfix: Cancel Sign In button didn''t function properly
    • bugfix: Skype API: OPEN CHAT command didn''t work 4 December 2007 ? 13 February 2008 ? 15 May 2008
    • improvement: added NAT-PMP support
    • improvement: added uPnP support
    • improvement: added Authenticated Proxy support
    • bugfix: 3–4 second delay when hanging up video call
    • bugfix: sometimes Skype crashed when applying changes in Edit Profile window
    • bugfix: "Add to Contacts" command was not working for 1-on-1 chats in history view
    • bugfix: "Add to list" button was cut off in Start Conference and Add Users to Chat windows on Tiger
    • bugfix: Safari 3.1 (4525.13) chats time-name were getting cut off.
    • bugfix: Abnormal exit on declining two sent files.
    • bugfix: Add and remove buttons were cut off in Send Contacts window on Leopard
    • bugfix: Add to Contacts command didn''t work in the context menu of the history list
    • bugfix: Address Book phone numbers with custom tags were not shown in Skype
    • bugfix: Call Transfer menu not updating when new contacts were added
    • bugfix: Chats were losing their topics
    • bugfix: Crash/hangup on Skype credit change when old SMS chats open for long time
    • bugfix: Default call window height was too small
    • bugfix: Do not add chats without activity timestamp to event history
    • bugfix: Fix for delayed sms delivery notifications
    • bugfix: Flag icons not showing in upper case
    • bugfix: Freeze with lots of Address Book contacts (>3000)
    • bugfix: History entries became blank when right-clicked on Leopard
    • bugfix: Improvements to audio sync
    • bugfix: Not possible to use the context menus of conference call participants when the call was muted or on hold
    • bugfix: Possible to change the value of sound level indicators in conference calls
    • bugfix: Leading 0 (zero) was removed when user tried to call to Italian landline number – they need leading 0
    • bugfix: Missed events badge was missing from chat drawer after Skype restart
    • bugfix: outgoing calls that went to voicemail didn''t have icons in the history view
    • bugfix: own voice level indicator was still moving when conference call was muted
    • bugfix: Skype crashed after "Delete all SMS Messages" was pressed
    • bugfix: sometimes Skype got stuck in the login process when Address Book integration was enabled
    • bugfix: sometimes window artifacts appeared when having two simultaneous calls
    • bugfix: Status does not reset correctly after screensaver triggers away if Set my status to Away when inactive for 0 minutes was set
    • bugfix: strange sound start happening on end of the call (Apple Bug ID# 5796436)
    • bugfix: when being signed in on at least two Macs and answering a call on one machine, then ringing didn''t not stop on the second machine
    • bugfix: When chats are closed after draging them around, wrong chat gets activated
    • bugfix: when placing a call, then sometimes the word "Button" was briefly displayed instead of the phone number
    • bugfix: Word wrap in Public chat settings window
    • bugfix: Workaround for strange large number startTimestamp on some chats (preventing chat history links displaying)
    • bugfix: yellow alert were hiding chat topics quite often.
    • change: replaced SkypeIn with Online Number
    • change: increased minimum size of SkypeOut Caller Window
    • change: new User Registration Window: By default, eMail notifications checked
    • change: pop-up dialog to enable or disable Address Book integration
    • change: sometimes duration of some calls was displayed as 1193 hours in the call history
    • change: sound event for contact coming online is now off by default
    • Skype API: BTN_RELEASED NO clears quickfilter field now (previously removed the last character only) 9 April 2009 localizations updated
    • change: spectator window for screen sharing
    • change: My Account page embedded in the client
    • bugfix: Skype didn''t hide on OS X login
    • bugfix: copy/paste from chats was not working correctly
    • bugfix: sometimes Skype froze for a couple of seconds when starting or stopping screen sharing
    • bugfix: screen sharing windows could be left on screen when a call was joined to a conference
    • bugfix: PiP didn''t appear in full screen when receiving screen sharing
    • bugfix: the overlay didn''t appear for fullscreen screen sharing and then the exit fullscreen button didn''t work
    • bugfix: fullscreen mode would exit after a held call was resumed
    • bugfix: call could not be ended after being redirected to voicemail
    • bugfix: the call window layout was broken if the dialpad was shown during a video call
    • bugfix: URLs inside brackets were not clickable
    • bugfix: sometimes Skype crashed after deleting missed events without reading them
    • bugfix: sometimes Skype Access sessions were not terminated properly
    • bugfix: sometimes Skype Access session durations were not displayed accurately
    • bugfix: sometimes extending a Skype Access session didn''t work as expected
    • bugfix: after signing in as another user, it was not possible to start a Skype Access session
    • bugfix: it was possible to start a new Skype Access session before previous one had finished
    • bugfix: Start Skype Access menu item was disabled when not signed in
    • bugfix: Skype Access session appeared in red after extending the session
    • bugfix: sometimes there were two controversial messages about Skype Access availability
    • bugfix: sometimes Skype crashed when leaving a chat
    • bugfix: history was not picking up display names from Address Book for text messages
    • bugfix: text on screen sharing selection buttons was misaligned on Tiger
    • bugfix: warning icon was not removed after extending online number
    • bugfix: after auto-recharge, balance pane had space on the right
    • bugfix: fixed enabling of Quick Add button in text-only toolbar mode
    • bugfix: sometimes (null) was added as a SkypeOut display name instead of the one specified
    • bugfix: ESC key now closes emoticon roster as it should
    • bugfix: fixed text positioning on Tiger for screen sharing selection window buttons
    • bugfix: if remote contact cancels a file transfer then sometimes it still appeared as pending on the receiver side
    • bugfix: do not set to status to away during screensaver when auto away is set to 0 minutes
    • bugfix: the PiP video could draw over Mute/Hold/Transfer overlays
    • bugfix: fixed video toolbar button enabling for the case where there is no camera or video is disabled
    • bugfix: fullscreen button and PiP views did not appear on Panther and Tiger if "keep call windows in front" option was turned on
    • bugfix: fullscreen view was not displayed correctly when entering full screen from the screen sharing spectator window
    • bugfix: multiple call windows were left open when calls failed
    • bugfix: call overlay window could appear without the call window if the call window was minimised while the other party was starting video
    • bugfix: fixed window resizing issues when the other party was starting and stopping video, which occurred because the wrong window sizes were being stored in defaults
    • bugfix: call window would resize incorrectly when the call was put on hold then resumed
    • bugfix: the call window''s fullscreen button could end up in the wrong position when exiting full screen while receiving screen sharing
    • bugfix: call window resizes when entering and exiting full screen mode while receiving screen sharing
    • bugfix: emoticon button rendered before the chat window
    • bugfix: fixed double free error when exiting fullscreen using the escape key
    • bugfix: fixed crash on chat close because overlay window was being double deallocated
    • bugfix: fixed incorrect call window layout, which sometimes occurred if the connection was dropped
    • bugfix: window did not resize correctly when showing the dialpad (it could extend offscreen) if the computer had multiple displays
    • bugfix: dialpad was not shown when exiting full screen
    • bugfix: fixed bad volume slider layout in call window, which could occur when answering a video call during an existing video call
    • bugfix: fixed exception being thrown because emoticon button was observing a dealloced chat
    • bugfix: fixed Quick Add window positioning when item was not first in the toolbar
    • bugfix: the Quick Add toolbar item appears pressed in all chat windows
    • bugfix: the dialpad could expand partially offscreen when it was shown, by moving the call window fully onscreen after the dialpad is shown
    • bugfix: the call window layout was broken if the toolbar was shown or hidden during a video call
    • bugfix: when assigning multiple contacts to groups screen refreshing was very slow
    • bugfix: adjusted layout of Quick Add window and make sure it doesn''t run under the Dock when it''s on the left or right
    • bugfix: added limits to the maximum width of the slider in the call window
    • bugfix: removed a small visual glitch after reducing size of contact list
    • bugfix: fixed small problem with rendering flags in chat
    • bugfix: after restart, second chat window didn''t remember its size and position
    • bugfix: prevent the user from calling their own online number
    • bugfix: chat window was not closed after database mount error
    • improvement: added Retry button to the Skype Access window
    • improvement: consistency with other Mac apps: added shortcut for Show Offline Contacts, moved Make Text commands to View menu, use Clear instead of *Delete wording
    • improvement: improved enabling of the video and screensharing buttons based on the receiver''s capabilities
    • improvement: improved toolbar button image rendering
    • improvement: improved new chat handling
    • improvement: some string adjustments
    • improvement: some internal optimizations and improvements
    • Skype API: Implemented get skypeversion
    • Skype API: Implemented: get chat x dialog_partner
    • Skype API: Open options command only accepted uppercase properties
    • Skype API: Implemented ping 20 July 2009 Hotfix 14 September 2009 Hotfix 21 September 2009
    • Skype Access: An incorrect notification message appeared "This WiFi hotspot does not support Skype Access" when users tried to connect to Skype Access when Airport was set to off.
    • Chat: Text was not visible within the chat input field that contained a certain Unicode character.
    • Contacts: Platform specific Skype for Mac OXS 10.3 (Panther); Skype froze after deleting unread missed events.
    • Contacts: Mood message appeared blank after playing iTunes.
    • Contacts: Contacts were still visible in the "Manage Contact Groups" after deleting them from the Contact List.
    • Video: Video appeared blank between Skype for Windows and Skype for Mac.
    • Video: A video error message appeared at the beginning of a video call.
    • Video: Video and screen sharing functionality did not work after a multichat
    • Screen Sharing: Recipients screen remained black after screen sharing was resumed.
    • Screen Sharing: A green line appeared when screen sharing between Skype for Windows and Skype for Mac OXS 10.4 (Tiger).
    • Screen Sharing: Skype froze when screen sharing between Skype for Windows and Skype for Mac.
    • Miscellaneous: An incorrect informative message appeared when entering more than 20 characters for a password.
    • Miscellaneous: The Show in Finder option was not available after cancelling a file transfer.
    • Miscellaneous: Platform specific OSX 10.3 (Panther); Skype could not connect to the network. Skype froze when selecting "Quit Skype".
    • Miscellaneous: The typing indicator appeared within a multichat even though no one was typing.
    • Miscellaneous: An incorrect informative message appeared when trying to call an emergency number.
    • Miscellaneous: Commas were not visible in mood messages.
    • Miscellaneous: A users name and password field appeared blank after selecting the option "Remember my name and password on this computer".
    • SMS: An error message appeared when dragging and dropping a participant to an SMS group.
    • SMS: An error message appeared when closing the SMS window after sending to multiple recipients.
    • SMS: SMS functionality did not recognize newly updated telephone numbers associated to Skype Out contacts.
    • SMS: Ringing sound was not available on incoming calls. 8 February 2010 Fixes issues 29 October 2010 Fixed login issues to Skype 17 November 2010 This was the most recent version that could run on the Power PC architecture. 8 February 2011 ? 24 March 2011 Hotfix 14 April 2011 ? 9 May 2011
    • Security updates
    • Resolves video freezing in high-packet loss networks
    • Fixes minor bugs 1 July 2011 ? 5 July 2011
    • Improved Multi-tasking
    • Group Screen Sharing
    • Sidebar enhancement
    • Support for Mac''s built-in HD and Logitech''s B910 HD cameras
    • Minor bug fixes 26 July 2011
    • Updated localizations
    • The removal of "Professional Account"
    • Minor improvements 8 August 2011
    • Updated contact list view
    • New contact grid view
    • Support for OS X Lion
    • Minor improvements 1 September 2011 Sometimes Skype crashed during video calls
    • Fixes a problem in Norwegian localization, which could lead to client freeze 15 September 2011
    • Facebook connect
    • Facebook chat
    • Skype Home
    • Improved video quality
    • Minor bug fixes 17 November 2011 Facebook video calls 12 January 2012
    • Improved Call UI
    • Accept incoming call with video
    • Improvements in quality and stabilization
    5.6 6 March 2012 Automatic Updates
    • Improved UI for group video calling
    • New full screen mode in OS X Lion
    • Ability to delete conversations
    • Ability to disable Audio Gain Control
    5.7 12 April 2012 ?
    5.7 9 May 2012 Hotfix
    5.8 14 June 2012
    • More Compact Contacts Monitor
    • Improved Screen Sharing (Premium)
    • OS X Mountain Lion Ready
    • Resizable Contact List Columns
    • Improved SMS Usability
    • Improved automatic reorientation of mobile video calls
    • Keyboard shortcut for Volume Control
    • Full HD video-calling
    6.0 24 October 2012
    • Microsoft and Facebook Account Integration
    • Ability to message Messenger users
    • Ability to call Messenger users
    • Localised into six more languages
    • Removal of online user count
    • Display previously created profile pictures
    • New user interface
    • Ability to Open Chats in Multiple Windows
    • Retina Display Support
    6.1 10 January 2013
    • ClicktoCall - Ability to call from Safari
    • Improved profile view
    6.2 13 February 2013
    • Ability to send eGifts
    • Ability to send SMS without verification
    6.3 13 March 2013
    • Slideshow of other participants in a group call
    • New In-Call DTMF dial pad
    6.4 15 May 2013
    • Infinite chat scrolling
    • Improved find from a chat conversation
    • Improved file transfer
    • Improved send and receive contacts
    • Support for Simplified Chinese
    • OS X 10.6 or later is required
    6.5 5 June 2013
    • Improved video messaging
    • Improved calling experience
    6.6 3 July 2013
    • Improved video messaging
    • Ability to update Skype under non-admin accounts
    6.7 31 July 2013
    • Improved search
    6.9 25 August 2013
    LinuxLinux Version History  
    This section requires expansion. (August 2012)
    Color Meaning
    Red Release no longer supported
    Green Release still supported
    Blue Future release
    Version Release Date Features/description 21 June 2004 first public beta
    1.0 1 February 2005 first stable version 25 May 2005 ? July 2005 ? 2005 ?  ? ?  ? ? 28 June 2006 sound system upgrade and more 17 August 2006 beta 27 September 2006 beta 4 October 2006 stable  ? ?
    1.4.0.xx 2 May 2007 ?
    1.4.0.xx 23 May 2007 ?
    1.4.0.xx 14 June 2007 ? 1 August 2007 improved audio
    1.4.0.xx 4 October 2007 ?
    2.0 7 November 2007 video is here
    2.0.x 6 February 2008 ?
    2.0.x 13 March 2008 ?
    2.1 26 August 2009 ? 21 January 2010 ?
    2.2 6 April 2011 ? 7 June 2011 ? 14 May 2012 libpng related security update
    4.0 14 June 2012 New Conversations View, new Call View, removed multiple instances support. 17 June 2012 4 bugs fixed
    4.1 15 November 2012 Integration with Microsoft Accounts (Messenger, Hotmail and Outlook.com). 20 May 2013 29 January 2014 Added workaround for PulseAudio 3.x and 4.x audio noise. Fixed rare crash when opening a chat due to a non existent emoticon. Fixed crash on Ubuntu/Debian 64-bit due to missing libasound2-plugins:i386 dependency. Fixed some dialpad''s numbers did not work properly. 18 June 2014 Cloud-based group chat, other features and bug fixes

    On 13 August 2014, Skype made notification that support for Android 2.2 and earlier devices will be dropped.

    Android Version History   Version Release Date Features/description  ? ?  ? ?
    1.0.2 2010 12 15
    • Use the app on your Samsung Galaxy S, as long as it’s running Android OS 2.2 or later.
    • Store the app on your phone’s SD card if it’s running Android OS 2.2 or later.
    1.0.3 2011 01 27 Improvements:
    • Improved switching call to speaker-phone and back
    • Improved loading speed of native address book display

    Fixed issues:

    • Skype crashed when getting an incoming Skype call while having other VOIP call active
    • Echo was heard with delay after muting microphone
    • Android users were shown to be in GMT+0 timezone for users on desktops
    • It was not possible to save birthday in Skype through keyboard 2011 07 04
    • Now available on additional Android handsets
    • Added Support for video calling on Google Nexus S (Europe) and Google Nexus S 4G (US Sprint) 2011 08 04 Video calling is now available on the following Android devices: Samsung Galaxy S II, Samsung Galaxy S, Samsung Droid Charge - Verizon, Samsung Galaxy Tab, HTC Desire (2.2), HTC Thunderbolt - Verizon, HTC Sensation, HTC Evo 4G, HTC Evo 3D, HTC Incredible S, HTC Desire HD, HTC Flyer, LG Revolution - Verizon (2.2), Sony Ericsson Xperia Play, Sony Ericsson Xperia Ray, Sony Ericsson Xperia Mini Pro, Acer A5 2011 09 29
    • 14 additional devices whitelisted for video calling.
    • Video calls now supported in portrait and landscape. Double-tap to zoom.
    • Revised Recent view - conversations now grouped around your contacts.
    • Improved support for Bluetooth headsets.
    • In-client advertising. (Advertising will not be shown to users that have Skype Credit, a Calling or Skype Premium subscription.)
    • It is possible to edit and delete IM messages.
    • Skype will no longer restart in the background when you sign out. 2011 10 25
    • Now easier to enable video calling
    • Improved audio quality on all devices
    • HTC EVO - fix for rotated video bug
    • Motorola Bionic/Photon/Xoom - fix for sign in bug
    • Fix for Bluetooth problems on Android 2.1
    • Fix for several other crash bugs
    • Other bug fixes 2011 ? 2011 12 14
    • Send pictures, videos and files
    • Easier to sign out, and auto-sign in
    • Improved look and feel with new graphics
    • Voicemail improvements
    • Better video quality on Tegra 2 devices 2011 12 16
    • Fix for start-up issues on Android 2.1
    • Fix for occasional white screen
    • Fix for video orientation on Galaxy Nexus 2012 02 17
    • Calling interface updated
    • Improved quality
    • Enabled video calling for Samsung Epic 4G Touch 2012 04 30
    • Restyled instant messaging view
    • Video rotation support for many more devices
    • Faster app start up 2012 08 31 Bluetooth improvements:
    • More reliable connection with headsets
    • More headsets supported

    Bug fixes:

    • No more random signing out
    • Fixed green video on HTC devices
    • Restored video quality on Nvidia-powered devices 2012 11 21
    • Microsoft Account login
    • IM with Messenger buddies
    • New UI for Android tablets
    • Wideband Silk audio codec support
    • Call auto-answer option 2013 01 25
    • Portrait calling on tablets
    • New languages: Portuguese, Norwegian and English (UK)
    • Performance improvements and fixes 2013 02 28
    • Video Messaging - preview feature
    • Try new Video Messaging. Record a video and send to friends and family on Skype, even when they’re unavailable. Everyone can send up to 20 free video messages; Skype Premium users can send as many as they like.
    • ''Classic view'' option for tablets
    • Performance improvements and fixes 2013 07 02
    • You can now sign out from any of the home screens in addition to the profile screen. Just hit the menu key from any of them.
    • For good measure we''ve fixed some more bugs too, including one that might have prevented you from making any calls or changing your status to online.
    4.3 2013 09 30 Changes:
    • Added support for 14 more languages: Catalan, Croatian, Czech, Greek, Hungarian, Latvian, Lithuanian, Serbian (Latin), Slovak, Slovenian, Romanian, Turkish, Ukrainian, Vietnamese.
    • The screen will stay lit when dialing (call setup) now. Once the call is connected, the proximity sensor will work as normal. This is to prevent WiFi from powering down, which was causing calls to fail before completion.

    Bug Fixes:

    • HTC specific crashes. Samsung specific issues.
    • Several display oddities, especially on small or low resolution screen phones.
    • Video calls would begin displaying call status information.
    • Audio routing to the wrong speaker.
    4.4 2013 10 09
    • Tablet owners rejoice! Now you get a totally new version of Skype too, including a modern design and performance improvements.
    • Video quality improvements - calls are clearer and higher resolution.
    • Accessibility improvements with full support for TalkBack.
    • Free accounts will see ads. But if you have Skype Credit, a subscription or a Premium account, you’ll continue to enjoy an ad-free experience. 2013 12 14
    • Picture-in-Picture lets you see your video call even when you switch to other apps;
    • Lots of contacts? Simply pinch your contact list to zoom out to an alphabet, then tap a letter to zoom in;
    • General fixes and performance improvements for all users;
    • Video messaging compatibility fixes.
    4.7 2014 03 18
    • Aggressive battery savings. 2014 05 20
    • General fixes and performance improvements for all users
    5.0 2014_q3
    • Requires association of Skype-users'' cellPhone-number
    Windows Phone

    Current version: 2.22

    Microsoft does not provide changelog information for Skype on its own mobile platform, Windows Phone, despite the fact that it does on Android, a competitor platform. Microsoft has abruptly pulled up Windows Phone 7 support. This is because the Skype app for Windows Phone is regarded as a "work in progress" and not a finished product.


    Skype application for Symbian disappeared from Nokia Store in 2012 and it is not available at the Skype official websites download page either. However the last official signed version (v2.1.0.23) of Skype for Symbian continued working until August 2014. On 8 August 2014 Skype sent an email to users who have ever signed in to Skype via its Symbian app informing them that the Symbian Skype app will stop working "within the next few weeks".


    As of 2014, a Skype client gateway is supported on Lorex survailance Security Camera systems. This allows a home security system camera system to appear like a Skype user account that others can add to view video and audio of on a lorex home security system. Use of Skype to connect to home security camera systems is an improvement over prior art security systems that required complication configuration of home router administration setup to allow IP ports to bypass the firewall. Using a Skype account also solves the problem of granting access to a home security camera system with multiple channels by allowing users to pick which users are in the user''s friends list.

    Security and privacy Main article: Skype security

    Skype is claimed initially to be a secure communication, with one of its early web pages stating "highly secure with end-to-end encryption". Security services were invisible to the user, and encryption cannot be disabled. Skype reportedly uses publicly documented, widely trusted encryption techniques: RSA for key negotiation and the Advanced Encryption Standard to encrypt conversations. However, it is impossible to verify that these algorithms are used correctly, completely and at all times as there is no public review possible without a protocol specification and/or the program source code. Skype provides an uncontrolled registration system for users with no proof of identity. Instead, a free choice of nicknames permits users to use the system without revealing their identity to other users. It is trivial to set up an account using any name; the displayed caller''s name is no guarantee of authenticity. A third party paper analyzing the security and methodology of Skype was presented at Black Hat Europe 2006. It analyzed Skype and found a number of security issues with the current security model.

    Skype incorporates some features, which tend to hide its traffic, but it is not specifically designed to thwart traffic analysis and therefore does not provide anonymous communication. Some researchers have been able to watermark the traffic so that it is identifiable even after passing through an anonymizing network.

    In an interview Kurt Sauer, the Chief Security Officer of Skype, said, "We provide a safe communication option. I will not tell you whether we can listen or not." This does not deny the fact that NSA monitors Skype conversations. Skype''s client uses an undocumented and proprietary protocol. The Free Software Foundation (FSF) is concerned by user privacy issues arising from using proprietary software and protocols and has made a replacement for Skype one of their high priority projects. Security researchers Biondi and Desclaux have speculated that Skype may have a back door, since Skype sends traffic even when it is turned off and because Skype has taken extreme measures to obfuscate their traffic and functioning of their program. Several media sources reported that at a meeting about the "Lawful interception of IP based services" held on 25 June 2008, high-ranking unnamed officials at the Austrian interior ministry said that they could listen in on Skype conversations without problems. Austrian public broadcasting service ORF, citing minutes from the meeting, reported that "the Austrian police are able to listen in on Skype connections". Skype declined to comment on the reports. One easily demonstrated method of monitoring is to set up two computers with the same Skype user ID and password. When a message is typed or a call is received on one computer, the second computer duplicates the audio and text. This requires knowledge of the user ID and password.

    The United States Federal Communications Commission (FCC) has interpreted the Communications Assistance for Law Enforcement Act (CALEA) as requiring digital phone networks to allow wiretapping if authorized by an FBI warrant, in the same way as other phone services. In February 2009 Skype said that, not being a telephone company owning phone lines, it is exempt from CALEA and similar laws, which regulate US phone companies, and in fact it is not clear whether Skype could support wiretapping even if it wanted to. According to the ACLU, the Act is inconsistent with the original intent of the Fourth Amendment to the U.S. Constitution; more recently, the ACLU has expressed the concern that the FCC interpretation of the Act is incorrect. It has been suggested that Microsoft made changes to Skype''s infrastructure to ease various wiretapping requirements; however, Skype denies the claims.

    Some time before Skype was sold in 2009, the company had started its own program, called Project Chess, to explore legal and technical ways to easily share calls with intelligence agencies and law enforcement.

    On 20 February 2009 the European Union''s Eurojust agency announced that the Italian Desk at Eurojust would "play a key role in the coordination and cooperation of the investigations on the use of internet telephony systems (VoIP), such as ''Skype''. ... The purpose of Eurojust’s coordination role is to overcome the technical and judicial obstacles to the interception of internet telephony systems, taking into account the various data protection rules and civil rights"

    In November 2010, a flaw was disclosed to Skype that showed how hackers could secretly track any user''s IP address. As of 2013, this has still not been fixed.

    In 2012, Skype introduced automatic updates to better protect users from security risks, but received some challenge from users of the Mac product, as the updates cannot be disabled from version 5.6 on, both on Mac OS and Windows versions, although in the latter, and only from version 5.9 on, automatic updating can be turned off in certain cases.

    According to a 2012 Washington Post article, Skype "has expanded its cooperation with law enforcement authorities to make online chats and other user information available to police"; the article additionally mentions Skype made changes to allow authorities access to addresses and credit card numbers.

    In November 2012, Skype was reported to have handed over user data of a pro-Wikileaks activist to Dallas, Texas-based private security company iSIGHT Partners without a warrant or court order. The allegation was an apparent breach of Skype''s privacy policy. Skype responded with a statement that it launched an internal investigation to probe the breach of user data privacy.

    13 November 2012, a Russian user published a flaw in Skype''s security, which allowed any person to take over a Skype account knowing only the victim''s email by following 7 steps. This vulnerability was claimed to exist for months, and existed for more than 12 hours since published widely.

    14 May 2013, it was documented that a URL sent via a Skype instant messaging session was usurped by the Skype service and subsequently used in a HTTP HEAD query originating from an IP address registered to Microsoft in Redmond (the IP address used was The Microsoft query used the full URL supplied in the IM conversation, and was generated by a previously undocumented security service. Security experts speculate the action was triggered by a technology similar to Microsoft''s SmartScreen Filter used in its browsers.

    The 2013 mass surveillance disclosures revealed that agencies such as the NSA and the FBI have the ability to eavesdrop on Skype, including the monitoring and storage of text and video calls and file transfers. The PRISM surveillance program, which requires FISA court authorization, reportedly has allowed the NSA unfettered access to its data center supernodes. According to the leaked documents, integration work began in November 2010, but it was not until February 2011 that the company was served with a directive to comply signed by the attorney general, with NSA documents showing that collection began on 31 March 2011.

    Service in the People''s Republic of China
    This article''s factual accuracy may be compromised due to out-of-date information. Please update this article to reflect recent events or newly available information. (January 2012)

    Since September 2007, users in China trying to download the Skype software client have been redirected to the site of TOM Online, a joint venture between a Chinese wireless operator and Skype, from which a modified Chinese version can be downloaded. The TOM client participates in China''s system of Internet censorship, monitoring text messages between Skype users in China as well as messages exchanged with users outside the country. Niklas Zennström, then chief executive of Skype, told reporters that TOM "had implemented a text filter, which is what everyone else in that market is doing. Those are the regulations." He also stated: "One thing that’s certain is that those things are in no way jeopardising the privacy or the security of any of the users."

    In October 2008, it was reported that TOM had been saving the full message contents of some Skype text conversations on its servers, apparently focusing on conversations containing political issues such as Tibet, Falun Gong, Taiwan independence, and the Chinese Communist Party. The saved messages contain personally identifiable information about the message senders and recipients, including IP addresses, usernames, land line phone numbers, and the entire content of the text messages, including the time and date of each message. Information about Skype users outside China who were communicating with a TOM-Skype user was also saved. A server misconfiguration made these log files accessible to the public for a time.

    Research on the TOM-Skype venture has revealed information about blacklisted keyword checks, allowing censorship and surveillance of its users. The partnership has received much criticism for the latter. Microsoft remains unavailable for comment on the issue.

    According to reports from the advocacy group Great Fire, Microsoft have modified censorship restrictions and ensured encryption of all user information. Furthermore, Microsoft is now partnered with Guangming Founder (GMF) in China.

    No Skype Calls within India

    "As of November 10, 2014, Skype will end support for calling within India meaning calls to mobiles and landlines from Skype within India will no longer be available," Skype''s parent company Microsoft said in a statement on 8 October 2014. Microsoft said, "Users in India can still make free Skype-to-Skype calls worldwide, international calls to mobiles and landlines and users outside the country can call mobiles and landlines in India."


    Skype comes bundled with the following locales and languages: Arabic, Bulgarian, Catalan, Chinese (Traditional and Simplified), Croatian, Czech, Danish, Dutch, Estonian, Finnish, French, German, Greek, Hebrew, Hungarian, Indonesian, Italian, Japanese, Korean, Latvian, Lithuanian, Nepali, Norwegian, Polish, Portuguese (Brazilian and European), Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish, Ukrainian and Vietnamese.

    As the program (on Windows) offers users the option of creating new language files, at least 31 other (full or partial) localizations are also available for the following languages: Adyghe, Afrikaans, Albanian, Aragonese, Armenian, Basque, Belarusian, Bosnian, Breton, Chuvash, Cornish, Erzya, Esperanto, Faroese, Georgian, Irish, Khmer, Ligurian, Macedonian, Mirandese, Nias, Nynorsk, Palatinate German, Persian, Scottish Gaelic, Tajik, Tamil, Telugu, Uyghur (Persian and Latin script), Welsh.


    Skype uses URIs as skype:USER?call for a call.

    Customer service

    As of February 2012, Skype provides support through their Web support portal, support community, @skypesupport on Twitter, and Skype Facebook page. Direct contact via email and live chat is available through their Web support portal. Chat Support is a premium feature available to Skype Premium and some other paid users.

    In January 2010 Skype rescinded their policy of seizing funds in Skype accounts that have been inactive (no paid call) for 180 days. This was in settlement of a class action lawsuit. Skype also paid up to US$4 to persons who opted into the action.

    Skype''s refund policy states that they will provide refunds in full if customers have used less than 1 euro of their Skype Credit. "Upon a duly submitted request, Skype will refund you on a pro rata basis for the unused period of a Product".

    Skype has come under some criticism from users for the inability to completely close accounts. Users not wanting to continue using Skype can make their account inactive by deleting all personal information, except for the user name.

    Educational use

    Although Skype is a commercial product, its free version is being used with increasing frequency among teachers and schools interested in global education projects. For example Skype is being used to facilitate language exchange. Students in different parts of the world are paired off, each is a native speaker of the language that the other wishes to learn. In conversations over Skype they alternate between the two languages.

    Teachers are using Skype in unique ways to fulfill educational goals. The videoconferencing aspect of the software is valuable in that it provides a way to connect students who speak different languages, hold virtual field trips, and reach out to experts in varying fields of study. These experiences allow students a chance to apply what they are learning in the classroom to real-life experiences and it also achieves further learning opportunities.

    Skype in the classroom is another free tool that Skype has set up on its website. It provides teachers with a way to make their classrooms more interactive and interesting. Skype in the classroom is a service that teachers can sign up for that will allow students to meet other students, talk to experts, and share ideas. Teachers can collaborate with other teachers around the world and design different learning experiences for their students. There are various Skype lessons, in which students can participate. Teachers can also use Skype’s search tool and find experts in the field of their choice.

    Outages and downtime
    This section is outdated. Please update this article to reflect recent events or newly available information. (February 2012)

    On 16 August 2007, Skype became unavailable for two days to a majority of its users. Millions of users were requesting to log in at the same time following a routine Windows Update, and this flooded the peer-to-peer system.

    On 22 December 2010, it was reported that Skype experienced an outage estimated to represent 8 million foregone calls. Skype administrators placed the following message on their Twitter page: "Some of you may have problems signing in to Skype – we''re investigating, and we''re sorry for the disruption to your conversations...engineers and site operations are working non-stop to get things back to normal." The problem came down to the limited availability of "supernodes", affecting some versions of Skype. Later in the day, Skype''s CEO, Tony Bates, issued an apology. He said that the matter was being taken very seriously and was being thoroughly investigated. He said that malicious attack was not being ruled out as a problem cause and he put his estimate of the foregone calls at about 10 million. On 23 December 2010, Skype''s blog with Tony Bates issued another apology through a video posted on YouTube for the Skype outage.

    The problem persisted across North America, Latin America, Europe and Asia. It had started to subside by 8:30 p.m. UTC. However, users were warned it might take several hours for the program to be fully operative again. It was reported at 9:27 am 23 December UTC that most users were able to log in again although some still could not. On the other hand into Thursday only about a third of the expected traffic was actually using Skype, relative to the time-period. On 23 December 2010, Skype said on its blog that the system had stabilized, and a detailed explanation of the incident was published six days later. Bates offered all Pay As You Go and Pre-Pay customers a free call to any landline as compensation. Subscribers had their subscription extended by one week.

    Open source alternatives

    Open source alternatives to Skype include Jitsi, Ekiga, Tox and Vox. These multiplatform clients can encrypt chats, calls and video calls. Users need to register an XMPP account to use some of the software.

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