Microsoft Virtual Labs http://technet.microsoft.com/en-us/virtuallabs/bb499043 Microsoft Virtual Academy http://www.microsoftvirtualacademy.com Blogs http://smtp25.blogspot.ca/ http://www.msexchangegeek.com Exchange 2013 Exchange 2003 Prerequisites http://technet.microsoft.com/en-us/library/bb691354(v=exchg.150).aspx Here is a great link to setting up an Exchange 2010 DAG. http://www.exchange-genie.com/2009/04/database-availability-group-dag-exchange-2010/ Certs: http://www.msexchangegeek.com/2009/05/13/exchange-2010-emc-and-certificates-management-part-1/ Exchange 2010 Service Pack and CU Release Dates http://technet.microsoft.com/en-us/library/hh135098(v=exchg.141).aspx