Exchange 2003 on Windows x64? No way Jose!
Recently, I was at a customer implementing a full IT infrastructure - AD, Exchange, SQL, etc. - and we had a bunch of servers already installed. Most of these servers were new and they supported Windows x64, so what the heck, why not have state-of-the-art OS?
The problems arose when we started installing the Exchange Server machine. Forestprep and Domainprep went really smooth, no problem what so ever. But when I kicked the Exchange Setup, it kept warning me that ASP.NET was not installed. So after some Googling, I found out that this configuration is not supported (damn, I should have known that!).
You can run Exchange 2003 on x64 hardware as long as you install the 32 bit version of Windows. That's what I did.
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P.S. BTW, the Jose on the title, it's me: Rui Jose Silva ;-)