I do not have a backup copy of the mailbox database on my server.
Cause: You have not configured a back up solution for your mailbox database.
Solution: Use the recovery storage group feature in Exchange Server 2003 to create a backup copy of the Exchange mailbox database on the server. You can do this while the original database is still running and serving client computers. For information about how to create a backup copy of the Exchange mailbox database on the server, see "Using Microsoft Exchange Server 2003 Recovery Storage Groups" at the Microsoft Web site (http://go.microsoft.com/fwlink/?LinkId=70663).