Since this is probably the most common scenario that enterprises will face, here is a link on how to upgrade WSS/MOSS (SP1 only) on Windows Server 2003 to run on Windows Server 2008. http://technet2.microsoft.com/windowsserver/WSS/en/library/d55003f9-79e1-47c2-a2b8-f84b70dd72df1033.mspx?mfr=true
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