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
Features new to Windows Vista users—was a significant source of power transition failures in previous versions of Windows and often resulted in decreased battery life, overheated systems, potential data loss, and an eventual user distrust of power-saving capabilities. During the development of Windows Vista, Microsoft indicated that it would allow the sleep process to be vetoed in the operating system, but subsequent investigations by the company revealed that this capability was frequently abused by application developers. However, administrators can still enable veto functionality through group policy. Windows Vista introduces a new Hybrid Sleep power-saving mode that combines hibernation and sleep mode functionality. When active, Hybrid