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.
Check this out for more information - http://www.windowsservercatalog.com/svvp.aspx?svvppage=svvp.htm
Run the Support Policy Wizard here - http://www.windowsservercatalog.com/svvp.aspx?svvppage=svvpwizard.htm