Delete default Mailbox Database | Move Arbitration Mailboxes


As with earlier versions, when you install the first Exchange 2010 Server a Default Mailbox Database is created and to maintain the Uniqueness a random number is added to the Mailbox Database name. When administrators try to delete or remove the Default Mailbox Database, it results in a error as follows:

The mailbox database ˜<database name> cannot be deleted.

Error: This mailbox database contains one or more mailboxes or arbitration mailboxes. To get a list of all mailboxes in this database, run the command Get-Mailbox -Database . To get a list of all arbitration mailboxes in this database, run the command Get-Mailbox -Database -Arbitration. Before you can remove this mailbox database, you must disable, move or remove user mailboxes and move arbitration mailboxes.

So what causes it and how can we overcome this…

This is due to fact that there are still Arbitration Mailboxes in the Default Mailbox Database, which are not Managed/Moved from the Exchange Management Console (EMC). The activities that we need to perform are as follows:

  • Use Get-Mailbox Database to get list of Mailboxes
  • Followed by New-MoveRequest to start moves
  • Verification using Get-MoveRequest | Fl, to ensure status for each of the system and federatedemail mailboxes is Completed
  • Finally Remove-MoveRequest powershell cmdlet before we remove the Mailbox Database