Beta Exam 70-638: TS: Microsoft Office Communications Server 2007, Configuring

The beta period to pass the TS: Microsoft Office Communications Server 2007, Configuring has been available during the August 28 and September 14,but unfortunately for me, i have tryied to get a seat the first week of september, but the inscriptions was closed.

During my inscription, I have notice that the reference number was 70-638 on the beta invitation, but on the prometric website the reference is actually 71-638. Maybe the exam number has change between the beta and the final version.