My Outlook tries to compact, it does compact to an extent then I get the error, outlook cannot compact, in use by another application.?

Hello,

There are several possibilities but basically you need to find out what is accessing your outlook data file. Make sure you do not have more than one copy of outlook running and you are not checking mail while it is trying to compact. Go into the account settings and set the send receive time to 30 minutes or disable it temporarly and restart outlook. IF it is still giving the error then reboot and try again. then check the Task Manager for applications that may be accessing the file. If you have no other choice backup your outlook files (normally to a .pst file format, make two copies just in case.) remove and restore the datafile from the backup.

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