I just found out yesterday that beta exam 71-662: TS: Microsoft Exchange Server 2010, Configuring is now available. This beta exam is available to take between August 31, 2009 and September 14, 2009. You can start registering for the exam
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Read the complete post at http://blogs.technet.com/haroldwong/archive/2009/08/25/exchange-server-2010-beta-exam-71-662-is-available.aspx