http://blogs.technet.com/b/omers/archive/2011/09/18/dag-beyond-the-a.aspxWe all know that in the Microsoft Exchange world DAG stands for “Database Availability Group”. Database – because on a highly available Exchange 2010 Mailbox server, the database , not the server, is the unit of availability and it is the database thaten-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)