Windows Server 2008, 2008 R2 (Standard/Web/Enterprise/Datacenter Editions) 64-bit Windows HPC Server 2008 Windows 2008 Hyper-V Windows Server 2003, 2003 R2 (Standard/Web/Enterprise/Datacenter Editions) 32/64-bit RHEL 5, 6 Server 64-bit SLES 10, 11 64-bit VMware vSphere 4.0, 4.1