* Template:Windows 7
Windows 7 April 2007 Pre-Milestone 1
Build 6415 (build date of April 4 2007), (6.1.6415.070404.1234)
Build 6418 (build date of April 4 2007), (6.1.6418.070404.1255)
May 2007 Build 6429 (build date of May 14 2007), (6.1.6429.070514.1730)
August 2007 Build 6459 (build date of August 26 2007), (6.1.6459.1.070826.1730)
December 2007 Build 6475 (build date of December 8 2007), (6.1.6475.1.11000.071108.1226)
Milestone 1
The first known build of Windows 7 was identified as a "Milestone 1 (M1) code drop" according to TG Daily with a version number of 6.1.6519.1. It was sent to key Microsoft partners by January 2008 in both x86 and x64 versions. Though not yet commented on by Microsoft, reviews and screenshots have been published by various sources. The M1 code drop installation requires Windows Vista with Service Pack 1, and creates a dual-boot system with Windows Vista.
Build 6519 (build date of December 20 2007), (6.1.6519.1.071220.1730)
Build 6522 (build date of December 23 2007), (6.1.6522.1.071223.1309)
April 2008
Build 6574 (build date of April 20 2008), (6.1.6574.1.080420) The second build of M1 was leaked with a version number of 6.1.6574.1. This build included improvements to Windows Explorer as well as a new Windows Health Center.
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