We’ve got some weird errors on our Exchange 2007 Mailbox Server. We received this error :

Event ID : 9823
Source : MSExchangeIS Mailbox Store
Log : Application Log
An invalid event history watermark has been detected by background cleanup. The watermark will be deleted.
Database: ‘First Storage Group\Mailboxstore1′.
Consumer: ‘df4b5565-53e9-4776-a824-185f22fb3ca6′.
Mailbox: ‘4ec8c6f9-dbab-43db-a8ac-cb6f62fc556c’.
Watermark counter: ‘0×4AC2AD’.

Funny enough there is no Read more »