As of today this bug ist still existent in Oneiric with all updates installed. The strange thing is that it is working correctly most of the time. But 2-3 times a day I have to click on the unread messages in the messaging menu although Thunderbird is already focused and all messages are read. This is very confusing, and I recommend to turn of the messaging menu addon in Thunderbird to other users.
As of today this bug ist still existent in Oneiric with all updates installed. The strange thing is that it is working correctly most of the time. But 2-3 times a day I have to click on the unread messages in the messaging menu although Thunderbird is already focused and all messages are read. This is very confusing, and I recommend to turn of the messaging menu addon in Thunderbird to other users.