Windows 7 worked on Windows 7. These were broadly divided into "core operating system" and "Windows client experience", in turn organized into 25 teams of around 40 developers on average. In October 2008, it was announced that Windows 7 would also be the official name of the operating system. There has been some confusion over naming the product Windows 7, while versioning it as 6.1 to indicate its similar build to Vista and increase compatibility with applications that only check major version numbers, similar to Windows 2000 and Windows XP both having 5.x version numbers. The first external release to select Microsoft
Development of Windows Vista Pack 2 RC Escrow Build Number 6002.16659.090114-1728 (Version 275) Released January, 2009. Windows Vista Service Pack 2 Release Candidate Build Number 6002.16670.090130-1715 (Version 286) Released February, 2009. Windows Vista Service Pack 2 RTM Escrow build to Connect Beta Testers Build Number 6002.17043.090312-1835 (Version ???) Released March, 2009. Available and can be installed via Windows Update Windows Vista Service Pack 2 RTM Escrow Build Number 6002.17506.090313-1730 (Version ???) Released March, 2009. Leak to file sharing websites. Windows Vista Service Pack 2 RTM Build Number 6002.18005.090410-1830 Released 28 April 2009. Officially released by Microsoft via Windows Update on 26 May 2009. –