How to Delete the First Database and Move the System Mailboxes

When you try to delete the Default Mailbox Database(created with 1st installation of the Mailbox Role), you receive the error below:

“This mailbox database contains one or more mailboxes or arbitration mailboxes. Before you can remove this mailbox database, you must disable, move or remove user mailboxes and move arbitration mailboxes.”

The First database contains the SystemMailboxes which are the Arbitration mailbox(es).

We have to move these system mailboxes to another database before of remove the Default Database.

1. Find the Arbitration Mailbox using the Exchange MAnagement Shell (EMS):

2. Now create a new move request in order to move the system mailboxes to another mailbox database:

3. Verify whether the move request completed:

4. Now remove the move request

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