That's because XP Pro x64's codebase (WS 2003 SP1) was already at service
pack level one when XP Pro x64 rtm'd last year.
I suspect that you will see the same thing happen when Longhorn Server
rtm's. Since it shares the same codebase with Vista and it looks like LH
Server will release simultaneously with Vista SP1, the codebase would then
be at service pack level one and LH Server would later go from LH Server
Gold to LH Server SP2 without ever having a separate SP1 release. Plenty of
folks will ask about that one, wondering if they somehow missed seeing a
release. We get the question now in the 64bit newsgroup about the "missing"
XP Pro x64 SP1.
Richard G. Harper said:
Windows Server 2003 and Windows XP x64 share service packs.
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Since there never was an SP1 release for XP Pro x64 it sounds a little
odd at first.