The last big release of Microsoft Exchange, Exchange Server 2007, marked a major change from the previous edition. Exchange 2007 introduced unified messaging, a completely new management client, and improvements to almost every aspect of the mail server, but at the cost of a whopping learning curve for administrators. Admins will have an easier go of it this time around.
Bottom line: Although pricing has yet to be announced, based on operational and usability improvements, Microsoft Exchange Server 2010 will be a major step up from Exchange Server 2007. A potential hurdle: Support for Windows Server 2003 is dropped in favor of Windows Server 2008 only.
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