Exchange 2010 coding is DONE and ready to start shipping really soon. Watch the press for more details on release dates, and you may start downloading code sooner than you think if you’re on MSDN/Technet or have the correct licensing in place.
For more details have a look at the post that went out today: http://msexchangeteam.com/archive/2009/10/08/452775.aspx
All in all, well done on a three year project. Well done Exchange team and I look forward to the NEXT release when it’s ready!