However, be aware that the 32-bit version will NOT be supported in a production environment, and as noted, that's the reason it's not likely to ship on the Exchange Server 2007 RTM media as well.
Also note, if your existing desktops, notebooks and servers have a 64-bit CPU -- like most current Intel Xeon processors, Intel Pentium D, or AMD Athlon, Opteron or Turion CPUs -- but are currently running a 32-bit Windows OS, you will be able to run 64-bit Windows server OS on these.
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