1. Exit Outlook and browse to one of the following file locations:

Outlook 2016: C:\Program Files (x86)\Microsoft Office\root\Office16
Outlook 2013: C:\Program Files (x86)\Microsoft Office\Office15
Outlook 2010: C:\Program Files (x86)\Microsoft Office\Office14
Outlook 2007: C:\Program Files (x86)\Microsoft Office\Office1

2. Open SCANPST.EXE.
3. Select Browse to select the Outlook Data File (.pst) you want to scan. If you need help locating your Outlook Data File, see Locating the Outlook Data Files.
4. Choose Start to begin the scan.
5. If the scan finds errors, choose Repair to start the process to fix them.
6. When the repair is complete, start Outlook with the profile associated with the Outlook Data File you just repaired.