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Event ID: 459 Source: ESE

Source
Level
Description
Information Store (nnnn) <storage group name>: The file <log path of the storage group>\Enn00000.log is missing and could not be backed- up.
Comments
 
As per ME946799, this may be recorded in certain conditions when using NTBACKUP. The backup fails, the incorrect log generation information is written to the database header. A hotfix is available. See the article for more details.
This issue may occur if the backup operation is completed successfully and it does not truncate the Exchange Server log files successfully. See ME935634 to resolve this issue.

If the missing file is a log file, you will not be able to perform an incremental backup. See MSEX2K3DB for additional information about this event.

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