History
Development of Windows 8 started before the release of its predecessor, Windows 7, in 2009.
At the Consumer Electronics Show in January 2011, Microsoft announced that the next version of Windows would add support for devices with ARM microprocessors, and showcased an early version of what would become Windows 8, NT 6.2 build 7867, running on several prototype ARM devices. Details also began to surface about a new application framework for Windows 8 codenamed "Jupiter", which would be used to make "immersive" applications using XAML(similarly to Windows Phone and Silverlight) that could be distributed via a new packaging system and a rumored app store.
Three milestone releases of Windows 8 leaked to the general public on April 12, 2011.
Many other builds were released until the Japan's Developers Day conference, when Steven Sinofsky announced that Windows 8 Release Preview (build 8400) would be released during the first week of June. On May 28, 2012, Windows 8 Release Preview (Standard Simplified Chinese x64 edition, not China-specific version, build 8400) was leaked online on various Chinese and BitTorrent websites. On May 31, 2012, Windows 8 Release Preview was released to the public by Microsoft.
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