Thunderbird does not always show folders
I've been using Thunderbird happily for many years, but a couple of days ago, it started making problems. It sometimes shows only my mail address, but no folders, so I cannot get to my mails. Sometimes it shows only the folder for incoming mails, but no "sent". Or "sent" ist empty. Sometimes everything works. (I have a second mailaddress in this thunderbird app, for which all folders are present, no problems there)
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You may have encountered this bug, which is fixed in upcoming version 160, which has just been released.
https://bugzilla.mozilla.org/show_bug.cgi?id=2087454
It has to do with the email server software that some providers use. If that server is configured in certain ways, Thunderbird can lose track of the folders. It's an unusual situation, which is why it hasn't come up before. The provider that has been coming up most lately is TalkTalk, but there are probably others.