Scott Schnoll has a great post on the differences between the various versions of Exchange 2007. He also sheds light on one of the most commonly asked questions - can you upgrade from the Trial version to Retail? (the answer is yes ) http://blogs.technet
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Read the complete post at http://blogs.technet.com/jkruse/archive/2007/01/29/exchange-2007-platforms-editions-product-keys-and-versions.aspx