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#11
Try opening Outlook in safe mode (maybe some add-in is blocking file:
Also check option 4 in this blog post:1. Right-click the Start button, and click Run.
2. Type Outlook.exe /safe, and click OK.
Tip: If Windows can't find Outlook.exe /safe, try using the full path to Outlook (for example C:\Program Files\Microsoft Office\OfficeXX, where XX is your version number).
howto-outlook.com | faq/deletemessage - Scan your pst-file for errors