Yes - they're not compatible. :)
Exchange Server 2003 System Requirements:
http://www.microsoft.com/technet/prodtechnol/exchange/2003/sysreqs.mspx
--
Bharat Suneja
MVP - Exchange
www.zenprise.com
NEW blog location:
exchangepedia.com/blog
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"Robert Gordon"
news:eI3UU2PFIHA.6120@TK2MSFTNGP05.phx.gbl...
> Are there any gotchas to running Microsoft Exchange 2003 Enterprise (32
> bit version) on Windows Server 2003 R2 64-bit? And is it better to run
> 64-bit Server on a true 64 bit CPU like an Opteron, or is it OK to run it
> on a CPU with 64 bit extensions, like an Intel Xenon Dempsey CPU?