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
Windows Vista the table. The maximum number of logical processors in a PC that Windows Vista supports is: 32 for 32-bit; 64 for 64-bit. The maximum number of physical processors in a PC that Windows Vista supports is: 2 for Business, Enterprise, and Ultimate, and 1 for Starter, Home Basic, and Home Premium. Microsoft occasionally releases updates such as service packs for its Windows operating systems to fix bugs, improve performance and add new features. Windows Vista Service Pack 1 (SP1) was released on February 4, 2008, alongside Windows Server 2008 to OEM partners, after a five-month beta test period. The initial