The switch from Exchange 2003 to Exchange 2007 wasn’t compelling. Complete re-write to only 64bit architecture only, and higher system requirements particularly in the memory. Hopefully Exchange 2010 will offer smaller footprint and performance improvements to warrant an upgrade. One of the first things I will do is to test if Exchange 2010 performs well within VMware or Virtual Server.
http://www.microsoft.com/exchange/2010/en/us/trial-software.aspx
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