Welcome to the Windows Server Virtualization Validation Program

To improve customers’ support experiences when running Windows Server on virtualization technologies other than Hyper-V™ and Virtual Server, Microsoft has launched the Server Virtualization Validation Program (SVVP).

SVVP is open to any vendor that delivers a machine virtualization solution that hosts Windows Server 2008 R2, Windows Server 2008, Windows 2000 Server Service Pack 4 (SP4)and Windows Server 2003 Service Pack 2 (SP2) and subsequent service packs. The virtualization solution can either be hypervisor-based or a hosted solution. The program enables vendors to validate various configurations so that Microsoft customers can receive technical support for Windows Server in virtualized environments.

Customers can benefit from the support provided by Microsoft as part of the regular Windows Server technical support framework when running Windows Server 2008 R2, Windows Server 2008, Windows 2000 Server SP4 and Windows Server 2003 SP2 and subsequent service packs on validated solutions running on server hardware Certified for Windows Server 2008 or Windows Server 2008 R2, with the same validated processor architecture and not exceeding the maximum virtual memory or processors validated. Microsoft Life Cycle Support policy still applies for support and end of support for specific versions of an operating system and Service Packs.

Read more here
http://www.windowsservercatalog.com/svvp.aspx