Windows XP Professional x64 Edition uses the Windows Server 2003 tree

Interesting…

Note The x64-based versions of Windows Server 2003 and of Microsoft Windows XP Professional x64 Edition are based on the Windows Server 2003 code tree. Service and support activities for Windows XP Professional x64 Edition use the Windows Server 2003 tree and do not use the Windows XP client tree.

link: http://support.microsoft.com/kb/914961

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