Andrew Dugdell did a great job summarizing all Support articles describing Microsoft policy about virtualization:
- Microsoft Virtual Server support policy
- Supported operating systems in Virtual Server 2005
- Support policy for Exchange Server 2003 running on hardware virtualization software
- Support policy for Microsoft software running in non-Microsoft hardware virtualization software
- Windows Server System software not supported within a Microsoft Virtual Server environment
- Virtual machines support in Microsoft Operation Manager (MOM) 2005
New article about virtualization support from me: