I have a virtual setup for exchange 2010 sp1 ur6: 2 cas, 2 mbx DAG with my VM's spread across 4 hosts. I have 6 databases with 3 each set to active on each mbx. This morning all of the db's were mounted on mbx2. When I tried to activate the database copy to to their original home the users in that DB lost access to email. The database showed mounted on mbx1 and it showed healthy/mounted in a get-mailbodatabasecopystatus. As soon as I moved it back access was restored. Any ideas?