Thunderbird is telling me that there is an unread message and it is one I read several days ago, listed in bold type again.
Every day or so Thunderbird says there is an unread message. I look for it and find it on the list of my messages received. It is in bold type as if it is unread. However I had read the message days ago. I had this problem a couple weeks ago and decided to delete all the messages in my inbox. That solved the problem for a couple weeks, now it is back. I thought at first it was because my inbox was getting overloaded but now there are only a couple hundred messages in it. Maybe I should just uninstall Thunderbird and then install it again.
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remove all mails from the inbox (Copy them to another folder or delete them. It makes litle difference.
Now Select File menu (alt+F) > compact folders.
I am guessing there is some corruption hiding away in there. A compact should fix it, but will do it better on an empty folder.