Exchange 2010 is Code Complete and on its way to General Availability
According to the MS Exchange Team Blog, Exchange 2010 Code is ready for RTM :)
You can read all the details at the original post location :
You Had Me At EHLO... : Exchange 2010 is Code Complete and on its way to General Availability
https://msexchangeteam.com/archive/2009/10/08/452775.aspx