Exchange Server 2010 and Windows Server 2008
If you have not found this out already, keep this in mind for future Exchange Server 2010 planning. Exchange Server 2010 *only* runs on Windows Server 2008 x64 or Windows Server 2008 R2 x64. I recommend starting out with Service Pack 2 due to the number of patches that will be required if you are running SP1. And, there is NO x86 bit test version.