Windows 2008 or Windows 2003 R2 servers running on VMware® ESX3.5 (Update 3) or 4.0 (License Manager Only)
Windows Vista 32- or 64-bit, Windows XP 32-bit, Windows 7 32-bit (Home Premium, Professional, Ultimate, and Enterprise), Windows
7 64-bit, Windows Server 32- or 64-bit.