Well, I missed the Christmas present from the Exchange team but for those of you eager to test the next generation messaging server, you have several new options. If you are a TechNet Plus Direct subscriber, you'll see the non time bombed RTM bits available
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Read the complete post at http://blogs.technet.com/keithcombs/archive/2006/12/27/exchange-server-2007-rtm-downloads-now-available.aspx