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Event ID: 9823 Source: MSExchangeISMailboxStore

An invalid event history watermark has been detected by background cleanup. The watermark will be deleted.
Database: "<database name>".
Consumer: "<consumer>".
Mailbox: "<mailbox name>".
Watermark counter: "<counter>".
This warning event indicates that an invalid event history watermark will be deleted so that all watermark fields are valid. A watermark is a checkpoint stored on the Exchange server that indicates the latest event (an operation such as MailboxCreated, MailboxMoveStarted, or MailboxMoveFailed) was processed on a mailbox. A watermark list helps the event consumers maintain a record of the events processed on a particular mailbox until any given point of time. A background cleanup process helps delete the old events periodically. See MSEX2K3DB for additional information about this event.

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