You’ll see more information coming around the release of Exchange. It seems Microsoft is still on schedule for releasing Exchange 2007 to the manufacturers (RTM) for December.
… Exchange Server 2007 will be released to manufacturing (RTM) in December of this year. The announcement was made in David Lemson’s keynote on November 7 at the Exchange Connections conference. …
… According to Paul Robichaux’s blog, during a show of hands in the keynote, approximately 25% of attendees indicated they had already installed a beta build of Exchange 2007. While that evidence is anecdotal, that’s still a good indication of the interest in this exciting major release of Exchange Server. …