wow, the MS Exchange team blog has a great post on how-to use the Exchange Server 2007 Mailbox Server Storage Cost Calculator
The post lays out each stop and explains the results. Unfortunately I don?t think we?ll be moving to exchange 2007 in 09 🙁 the CAL cost is just too much for next years budget. But we do plan on consolidating our 4 exchange 2003 servers within North American to a single exchange 2003 cluster. I?ve start looking into running a 1300 user exchange 2003 server on ESX. Most of the numbers and proof of concepts running exchange on ESX is for Exchange 2007. We?ll see how it goes.
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