One of the new features in Exchange 2007 SP1 is the “unlimited” storage for your mailbox databases, as you can see in this overview.
After installing Exchange 2007 SP1 Standard Edtion, I received the following eventid (1216).
So, let’s change some register keys to prevent this eventid. Open regedit and go to the following registerhives.
Here you can find your mailboxdatabases, this can be different in your situation.
Add a DWORD called Database Size Limit in GB. Lets change the decimal value to 180, this means 180 GB.
After dismounting and mounting the mailboxdatabase, you get the following eventid.