x64 Microsoft Desktop OS Supported List

Microsoft Windows XP Professional x64 Edition (RTM with SP1, SP2, Build 3790)

Microsoft Windows Vista x64 Edition

x64 Microsoft Server OS Supported List

Microsoft Windows 2003 Web x64 Edition (RTM, SP1, SP2, Build 3790)

Microsoft Windows 2003 Standard x64 Edition (RTM, SP1, SP2, Build 3790)

Microsoft Windows 2003 Enterprise x64 Edition (RTM, SP1, SP2, Build 3790)

Microsoft Windows 2003 Datacenter x64 Edition (RTM, SP1, SP2, Build 3790)

Microsoft Windows 2003 R2 Standard x64 Edition

Microsoft Windows 2003 R2 Enterprise x64 Edition

Microsoft Windows 2003 R2 Datacenter x64 Edition

Microsoft Windows 2003 Compute Cluster Server Edition x64

Microsoft Windows Longhorn Server x64 (BETA)