As of today the exam “70-663 PRO: Designing and Deploying Messaging Solutions with Microsoft Exchange Server 2010” is live at Prometric. Click here for info on preparing for 70-663 or to schedule this exam at Prometric.
On a side note, I checked the MCP site to see if the results of 71-663 (beta) were in. I passed! Wasn’t too hard though. That’s exam 28 on my list of MS exams since 1996.