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May 15, 2013, Microsoft's Windows division chief Windows 7 key financial officer and chief marketing officer Tami Majorelle (Tami Reller) in JP Morgan Technology, Media and Telecommunications Conference, said: Windows Blue formalize the official name of Windows 8.1, Windows 8 genuine users can upgrade for free. Windows 8.1 system will not only allow the "Start" button to return to the desktop, and for the keyboard, Outlook, search, entertainment and other functions also experience a large area optimization, boasts over as many as 800 of the windows key sale update, and will be officially announced 10 Launched the official version. June 26, 2013, Microsoft released Windows 8.1 Build 2013 General Assembly preview version, Microsoft has Windows 8.1 Build 9391 available to OEM partners for testing, and called the developer preview version (Developer Preview). Subsequently, Microsoft officially announced Windows8.1 Consumer Preview (ConsumerPreview), which is frequently mentioned in the Beta beta. Windows 8 users can get updates through the Windows Store. Windows 8.1 Atlas Windows 8.1 Atlas (42) August 14, 2013, Microsoft announced: from Beijing at 19:00 on October 17 onwards, Windows 8.1 will be on a global scale, start by Windows Windows 8 app store on a free update for the Windows 8 user push. In addition, Microsoft will be in the end of August will be distributed to OEM version Windows8.1RTM hardware partners. The original plan MSDN / Technet subscribers in October to get Windows 8.1 RTM version, but after intense discussions within Microsoft finally on September 9, 2013 to provide Windows RTM version 8.1 of the MSDN / Technet subscribers. October 17, 2013, Microsoft officially available to download Windows 8.1, all installed Windows 8 users can update via the Windows Store gained 8.1 version update. [2] Year 2014 April 2, 2014, Microsoft released Windows 8.1 Update In BUILD 2014 General buy windows key online Assembly, Windows 8.1 users can get all the installed upgrade for free. 2015 January 2015, Microsoft announced that in addition to the Enterprise Edition, all Windows 8.1 can upgrade for free within a year to Windows 10 [1] in Windows 10 Preview Congress, carried out within a year to get Windows 10 upgrade will be permanently free. [3]