Folders Repeatedly Corrupting - Any Solution Beyond Repairing?
Every few days, the index pane of some folder gets corrupted. Repair (right-click, Properties, Repair Folder) fixes it. Then a few days later this repeats, with a different folder. I have three IMAP accounts and this occurs on more than one of them.
Any suggestion for finding and fixing the underlying problem?
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Anti-virus software is often the culprit when Thunderbird mail files get corrupted. 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
Thank you, @christ1.
Would it be worth testing by disabling Norton and turning on Windows Defender, to see if that fixes things?
If the anti-virus scans are turned off for Thunderbird, will that make the system vulnerable to viruses?
Would it be worth testing by disabling Norton and turning on Windows Defender, to see if that fixes things?
It may fix things, at least temporarily. But chances are a similar problem will resurface at some point later. So You'd still have to create the exclusion for the Thunderbird profile. In any case, there is no need for a 3rd-party anti-virus software. Getting rid of Norton is what I'd do.
If the anti-virus scans are turned off for Thunderbird, will that make the system vulnerable to viruses?
It won't. Anti-virus software would still scan a malicious attachment in an email message when you attempt to save it to disk or run it (which you shouldn't anyway). And a message with a malicious attachment just sitting in your Inbox will not do any harm.