As you can see in attached image, the subject (date and sender) in the emails list is the just-received email i was waiting for... but the contents is one another old email (from Paypal) in another local folder ! When I open the email in a new thunderbird's tab , same thing. I deleted the amil, from deletede folder list the subject is still correct but the contents is bad. I restore the email in my main inbox and then the subject is the old's email subject : i lost completly the new email that I just received.... What a weird behavior ? That is a serious mistake! There is another bug i saw since a few years ; ghost lines in some folder email lists without any subject, and a received-date from 01/01/1970 !!!