9.
Microsoft unveiled more Windows 8 features and improvements on the first day of the Build Conference on September 13, 2011.[21] Microsoft released the first public beta build of Windows 8, Windows Developer Preview (build 8102) at the event. A Samsung tablet running the build was also distributed to all attendees of the conference.
10.
The build was released for download later in the day in standard 32-bit and 64-bit versions, plus a special 64-bit version for developers. This version included SDKs and developer tools (such as Visual Studio Express and Expression Blend) for developing applications for Windows 8's new interface.[22] The Windows Store was announced during the presentation, but was not available in this build.[23][24] According to Microsoft, there were about 535,000 downloads of the developer preview within the first 12 hours of its release.[25]
11.
Originally set to expire on March 11, 2012, in February 2012 the Developer Preview's expiry date was changed to January 15, 2013.[26]
12.
On February 19, 2012, Microsoft unveiled a new logo to be adopted for Windows 8. Designed by Pentagram partner Paula Scher, the Windows logo was changed to resemble a set of four window panes. Additionally, the entire logo is now rendered in a single solid color.[27]
13.
On February 29, 2012, Microsoft released Windows 8 Consumer Preview, the beta version of Windows 8, build 8250. For the first time since Windows 95, the Start button is no longer present on the taskbar (until brought back with the Windows 8.1 update), though the Start screen is still triggered by clicking the bottom-left corner of the screen and by clicking Start on the charms.[28] Windows president Steven Sinofsky said more than 100,000 changes had been made since the developer version went public.[28] The day after its release, Windows 8 Consumer Preview had been downloaded over one million times.[29] Like the Developer Preview, the Consumer Preview expired on January 15, 2013.
14.
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.[30] 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.[31] On May 31, 2012, Windows 8 Release Preview was released to the public by Microsoft.[32]
15.
Major items in the Release Preview included the addition of Sports, Travel, and News apps, along with an integrated version of Adobe Flash Player in Internet Explorer.[33] Like the Developer Preview and the Consumer Preview, the release preview expired on January 15, 2013.
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