Packing your service now

I just went to install the Windows 2003 Server Administration Tools Pack on my Windows 2000 desktop, and got the following error:

Windows Server 2003 Service pack 1 Administration Tools Pack can be installed only on computers running either Windows XP Professional 9with either Q329357 or Service pack 1 or later applied) or Windows Server 2003 (with the same Service Pack as that of Windows Server 2003 Service Pack 1 Administration Tools Pack).

Can anyone figure out what the last parenthetical bit (in bold) means? Many have tried and failed.

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