| Event Id | 9521 |
| Source | MSExchangeIS |
| Description | The database "First Storage Group\Mailbox Store Computer Name" cannot be unmounted because Backup is in progress. |
| Event Information | According to Microsoft: CAUSE : This behavior can occur if a backup process is running against another store (public or mailbox) in this same storage group. In this case, you cannot dismount another database in this storage group. WORKAROUND : To work around this behavior, wait for the backup of the other database to complete, and then attempt to mount the database. |
| Reference Links | You Receive an Error Message When You Attempt to Dismount a Database |
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