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AVG - We locked INBOX in your Quarantine because it's infected with malware.

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Hi, I started use Thunderbird email recently on Windows 10 PC. AVG Internet Security is installed.

When I use Thunderbird, AVG shows this message: We locked INBOX in your Quarantine because it's infected with malware.

I have searched this support community and found some information about some conflicts between Thunderbird and AVG.

My questions are: 1. The conflict above is an already known issue in this community? 2. Are there any recommendations what to do against this issue?

Thank you for your reply in advance.

Hi, I started use Thunderbird email recently on Windows 10 PC. AVG Internet Security is installed. When I use Thunderbird, AVG shows this message: We locked INBOX in your Quarantine because it's infected with malware. I have searched this support community and found some information about some conflicts between Thunderbird and AVG. My questions are: 1. The conflict above is an already known issue in this community? 2. Are there any recommendations what to do against this issue? Thank you for your reply in advance.
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The conflict above is an already known issue in this community?

See https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues#AVG

Are there any recommendations what to do against this issue?

When anti-virus is quarantining messages in your Inbox there's a high risk of data loss due to corruption of Thunderbird mail files caused by the anti-virus software.

These are some generic suggestions to avoid problems with anti-virus software.

Create an exception in your anti-virus software for the Thunderbird profile folder, so that the anti-virus real-time scanner will not scan it. https://support.mozilla.org/en-US/kb/profiles-where-thunderbird-stores-user-data#w_how-to-find-your-profile

Don't let your anti-virus software scan incoming and outgoing messages.

Don't let your anti-virus software scan attachments.

Don't let your anti-virus software intercept your secure connection to the server.

Remove any add-ons your anti-virus software may have installed in Thunderbird.

Keep it working. http://kb.mozillazine.org/Keep_it_working_-_Thunderbird

And last but not least, backup your Thunderbird profile on a regular basis. https://support.mozilla.org/kb/profiles-where-thunderbird-stores-user-data#w_backing-up-a-profile