So do you buy a 32-bit server for Exchange 2003 alone or a 64-bit one that can eventually host Exchange 12? If you go the 64-bit route, you also will need the 64-bit version of Windows Server, as well. Oh, by the way, Microsoft suggests also going with new multi-core processors, probably 2 of them, and being able to max out memory to 16GB when you upgrade to Exchange 12.
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