The final list of supported operating systems for VMs under Hyper-V RTM is now documented in KB954958.

Server:

Supported server operating systems
  • Windows Server 2008, x64-based editions
Note Virtual machines are configured to use one, two, or four virtual processors.
  • Windows Server 2008 Standard
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Datacenter
  • Windows HPC Server 2008
  • Windows Web Server 2008
  • Windows Server 2008 Standard without Hyper-V
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 Datacenter without Hyper-V
Windows Server 2008, x86-based editions
Note Virtual machines are configured to use one, two, or four virtual processors.
  • Windows Server 2008 Standard (x86 Edition)
  • Windows Server 2008 Enterprise (x86 Edition)
  • Windows Server 2008 Datacenter (x86 Edition)
  • Windows Web Server 2008 (x86 Edition)
  • Windows Server 2008 Standard without Hyper-V (x86 Edition)
  • Windows Server 2008 Enterprise without Hyper-V (x86 Edition)
  • Windows Server 2008 Datacenter without Hyper-V (x86 Edition)
Windows Server 2003, x86-based editions
Note Virtual machines are configured to use one or two virtual processors.
  • Windows Server 2003 R2 Standard x86 Edition with Service Pack 2
  • Windows Server 2003 R2 Enterprise x86 Edition with Service Pack 2
  • Windows Server 2003 R2 Datacenter x86 Edition with Service Pack 2
  • Windows Server 2003 Standard x86 Edition with Service Pack 2
  • Windows Server 2003 Enterprise x86 Edition with Service Pack 2
  • Windows Server 2003 Datacenter x86 Edition with Service Pack 2
  • Windows Server 2003 Web Edition with Service Pack 2
Windows Server 2003, x64-based editions
Note Virtual machines are configured to use one or two virtual processors.
  • Windows Server 2003 R2 Standard x64 Edition with Service Pack 2
  • Windows Server 2003 R2 Enterprise x64 Edition with Service Pack 2
  • Windows Server 2003 R2 Datacenter x64 Edition with Service Pack 2
  • Windows Server 2003 Standard x64 Edition with Service Pack 2
  • Windows Server 2003 Enterprise x64 Edition with Service Pack 2
  • Windows Server 2003 Datacenter x64 Edition with Service Pack 2
Microsoft Windows 2000 Server
Note Virtual machines are configured to use one virtual processor.
  • Windows 2000 Server with Service Pack 4
  • Windows 2000 Advanced Server with Service Pack 4
Linux distributions
Note Virtual machines are configured to use one virtual processor.
  • SUSE Linux Enterprise Server 10 with Service Pack 2 x86 Edition
  • SUSE Linux Enterprise Server 10 with Service Pack 2 x64 Edition
  • SUSE Linux Enterprise Server 10 with Service Pack 1 x86 Edition
  • SUSE Linux Enterprise Server 10 with Service Pack 1 x64 Edition