Exchange 2007: Platforms, Editions, Product Keys and Versions

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.com/scottschnoll/archive/2006/12/31/exchange-2007-platforms-and-product-keys.aspx