This is all from memory. I think its accurate. The interesting part is Windows 7 is actually Ver 6.1.7. Windows NT 3.5 = Ver 3.5 (NT Kernel) Windows NT 4.0 = Ver 4.0 (NT Kernel) Windows 95 = Ver 4.0 (x86 Kernel) Windows 98 = Ver 4.1 (x86 Kernel) Windows ME = Ver 4.1? (x86 Kernel) Windows 2000 = Ver 5.0 (NT Kernel) Windows XP = Ver 5.1 (NT Kernel) Windows Ser 2003 = Ver 5.1 (NT Kernel) Windows Vista = Ver 6.0.6 (NT Kernel) Windows Server 2008 = Ver 6.0.? (NT Kernel) Windows 7 = Ver 6.1.7 (NT Kernel) Windows Server 2008 R2 = Ver 6.1.? (NT Kernel)