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Sometimes the Outlook count for the Outbox folder shows it contains a message ("Outbox [1]"), but even with all filtering off, no the list of items in the folder is empty. It looks like a message that failed to send. This happens with an account backed by a .ost file. How do I recover the missing message?

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up vote 1 down vote accepted

Copy the location of the .ost file from the account Data File Properties. Then close Outlook and run scanpst.exe (located in "C:\Program Files\Microsoft Office 15\root\office15" for x64 Office 2013).

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