So your post in the Thunderbird support forum has nothing to do with Thunderbird, but something to do with the web infrastructure used by the project. If that assumption is correct the best place for your comment/question would be best posted in the github repository for the web site. https://github.com/thunderbird/thunderbird-website/issues

Sorry but no one here has anything to do with the web presence.

Thank you for replying and for the information you've provided.

That's a shame though, as I don't have a Microsoft account. Hopefully somebody who searches here for the issue they experience (the reason I brought it up) will have an account and would post an Issue on GitHub.

Regards

I've marked the topic as solved, because I think it should not attract attention from the moderators here any longer.

I believe that only a person experiencing the same issue (and thus searching for it here) will be motivated enough to actually post the Issue on GitHub. That person will find this topic in the search results regardless if it's "open" or "solved".

Obviously though, as for 2024-06-19, the issue is not solved — Thunderbird still receives an expired certificate and informs the user about it in a prompt.