Windows Vista of January 2009, it had been announced that Vista usage had surpassed Microsoft's pre-launch two-year-out expectations of achieving 200 million users. At the release of Windows 7 (October 2009), Windows Vista (with approximately 400 million Internet users) was the second most widely used operating system on the Internet with an approximately 19% market share, the most widely used being Windows XP with an approximately 63% market share. In May 2010, Windows Vista's market share had an estimated range from 15% to 26%. On October 22, 2010, Microsoft ceased sales of retail copies of Windows Vista, and the OEM sales for
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