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Cheers Jo, Thanks for the early reply.
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Am new to TS so built 2008 Terminal Server and also licenced 50 cals on another 2008 server activated a licence manager. &nbsp;Worked ok but due mainly to politics regarding a couple of application issues and the fact we are to remain on XP for a while and users are familiar with it I have had to rebuild the Terminal Server with 2003 R2. &nbsp;<br />
My question is will the 50 cals which were bought for 2008 still be valid or will I have to downgrade them if possible or purchase 50 new ones for 2003.
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Am new to TS so built 2008 Terminal Server and also licenced 50 cals on another 2008 server activated a licence manager.  Worked ok but due mainly to politics regarding a couple of application issues and the fact we are to remain on XP for a while and users are familiar with it I have had to rebuild the Terminal Server with 2003 R2.  
My question is will the 50 cals which were bought for 2008 still be valid or will I have to downgrade them if possible or purchase 50 new ones for 2003.

Do 2008 TS CALS work with TS 2003

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.