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Event ID: 5008 Source: MSExchangeSA

The message tracking log file C:\Program Files\Exchsrvr\SOCRATES.log\20020525.log was deleted.
As per Microsoft: "A logfile became outdated and was deleted to conserve disk space". See MSEX2KDB for additional information on this event.
On Exchange, one can configure message tracking in order to monitor the email traffic. In order to avoid filling up the drive, the older logs are periodically deleted and this message is recorded in the event log.
The System Attendant is set to delete the log files after x number of days. To fix this, open  MS Exchange Administrator and highlight the server and double click on the System Attendant on the right pane and change the Message tracking log file maintenance settings to the number of days required.  
See ME271426 - Message Tracking Log Removal Does Not Include Current Date.

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