Outlook Opens and then disappears

Situation: The user has a new PC running Office 365 latest version. It worked for a couple days. Now, when she opens the Outlook, it disappears. The Task Manager doesn’t show the Outlook running.

Troubleshooting:

1. Run Office 365 repair, that doesn’t fix the problem.
2. Installing Office 365 update, that doesn’t fix the problem.
3. Disabling all Add-ins, that doesn’t fix the problem.
4. Run Microsoft Support and Recovery Assistant for Office 365, that doesn’t fix the problem.
5. Try different Outlook profile. it is the same problem.
6. It could be bad PST problem. Run ScanPST.exe to Repair PST files. In Office 365/Office 2016, ScanPST.exe is located in C:\Program Files (x86)\Microsoft Office\root\Office16. That fixes the problem.