Consider the following scenario:
- You have a mailbox server that is a member of a Database Availability Group (DAG) in a Microsoft Exchange Server 2010 Service Pack 1 (SP1) environment.
- The Exchange Information Store service (Store.exe) is running on the mailbox server.
- The mailbox server hosts the active copy of the mailbox database.
- You try to unmount the active copy of the mailbox database.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.