Microsoft KB Archive/250656

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OL98: Error Message: PST Is In Use by Another Application

PSS ID Number: 250656

Article Last Modified on 1/14/2000

The information in this article applies to:

  • Microsoft Outlook 98

This article was previously published under Q250656


When you start Outlook, or try to access your personal folders file (.pst) stored on a network drive, you may receive the following error message:

File <drive and path>\xxxx.pst is in use by another application. Close Microsoft Exchange and all other mail-enabled applications and try again.

This problem occurs even if you have full access permissions and there is no password on the .pst file. The problem may appear intermittently.


This problem can occur if the .pst file is being accessed by a backup program. Larger .pst files take longer to back up and are more prone to this issue if the backup is running while someone is trying to access it.


Contact the server administrator for the network server that your .pst is stored on to stop the backup job, or wait for the backup to finish and then start Outlook.

Additional query words: 98

Keywords: kbprb KB250656
Technology: kbOutlook98Search kbOutlookSearch kbZNotKeyword3