Event 9871: There is an online maintenance overlap for database X

On my Exchange 2007 server, I ran TSM as backup client. TSM was scheduled to backup every night at 11 pm., In the mean while, I had scheduled the online maintenance in Exchange 2007 daily from 0am to 7am.
The following error occured every day in my event viewer

Event Type: Warning
Event Source: MSExchangeIS Mailbox Store
Event Category: Background Cleanup
Event ID: 9871
Date:  10/20/2008
Time:  7:00:00 AM
User:  N/A
Computer: %server name%
There is an online maintenance overlap for database “maildb1”. Please revise the online maintenance schedule. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

It seemed that the online maintenance schedule was overlapping TSM every night, which resulted in event 9871. TSM needed 1:15h to complete the backup.
After rescheduling the online maintenance to 1am to 7am, the error disappeared.

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