Let me start from the beginning.
We had been using Norton Internet Security with Outlook 2010, part of Office 2010 Professional Plus, for many years without incident.
Norton Internet Security was replaced by Norton Security. We were unable to obtain licenses for Norton Security from our supplier, for reasons which I am not going to go into.
We were advised to switch to Symantec Endpoint Protection. We have 12.1.5 (since upgraded to 12.1.6), unmanaged.
And that's when the troubles began, when Endpoint Protection was installed. Not on all PC's, but on about half a dozen. Not all the time, but often enough to be annoying.
- Outlook freezes when trying to send email.
- When you start up Outlook, you get an error:
Cannot open your default email folders. The file (pst file) cannot be opened
- Corrupted PST files
So I do a little research. Lo and behold Endpoint Protection is infamous for causing Outlook issues. Oh joy!
So what conclusion am I supposed to reach? And what am I supposed to do about this?
For now I've turned off the Outlook plugin. Now I have to wait to see what happens.