Great news! Exchange 2007 beta 2 is being launched today. The press release is here. You can download it or order it on DVD; the download isn’t active yet (I expect it any minute, but Microsoft.com is so huge there’s often a gap between press release postings and live bits).
In very closely related news, the Exchange 2007-compatible version of Microsoft Forefront (née Antigen) will be available today too.
Paul's Down-Home Page 