Office Portal Server 2003 client components for backward compatible doc libraries
Quick tip, if you get the message below when trying to map to a SP2001 document library after installing Office 2003, go to the url below to get the Microsoft Office Portal Server 2003 Client Components for the fix. One of my network guys rooted out this solution as part of the Office 2003 installation CD, but its now posted separately since it no doubt has become such a hard-to-resolve pain-in-the-buttooski for everyone involved.
http://www.microsoft.com/downloads/details.aspx?FamilyId=DF39E250-F7AE-445A-AC9D-A80C9035ED6B&displaylang=en
