Microsoft is beginning to backport Windows 7 features to Windows Vista, and as an integral part of the process, the company is also upgrading Vistas graphics technology to the level of Windows 7. Microsoft will only target Windows Vista SP2 with the DirectX 11 package in Platform Update for Windows Vista. Users that are currently still running the RTM or SP1 versions of Vista will not be getting upgraded.
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DirectX 11 for Windows Vista SP2 is Available
