Continuing issue with AVAST certificates, Thunderbird and Google

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I know  that many people have suffered this issue, and there have been many suggestions.
I took the drastic step of uninstalling AVAST completely. I also used the AVAST uninstall utility.

***After removing avast, Thunderbird still complains about certificates***

Is there some service/process still hanging around?

I'm ready to through my laptop through the window with all of the 'Confirm certificates' popups I continually get.

I've tried looking through the registry, but may have missed something.

How do I completely clean out AVAST and this "Man in the middle" Email problem?

Please

[Asyn]

Hi, no problems here with Thunderbird and Avast certs.
Anyway, follow instructions: https://www.avast.com/uninstall-utility

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Asyn,
As I said in my original post, I had tried the uninstall utility and it didn't resolve the problem.
I have been using AVAST since 2007. This is the 1st time I have found a need to try and remove it entirely.

So far the uninstall utility is failing to resolve my issue

[Asyn]

Open the cert manager in TB and search/remove the Avast certs.

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I am having the same problem.  I have exported and installed the avast cert twice on a brand new windows10 PC with fresh thunderbird but I still get the certificate error messages the minute I restart thunderdbird.

  How can this problem still exist after all these years?  Just telling users to disable the mail shields is not a solution.  Thanks in advance

[Asyn]

Repair Avast:
1. Control Panel -> Add/Remove programs -> Avast
2. Click on 'Repair'.
3. Follow instructions.
4. Reboot.