Thunderbird is doing stuff I have never seen in several years of using it. For one thing, somehow it has archived several years of messages automagically without me doing it manually. It left all the originals in my inbox. When I tried to delete a whole year of emails several thousand at a time, it seems to have undertaken a huge download operation that is bogging the machine down. How can I cancel this operation? Second problem is that it somehow put two copies of every email in the 2014 archive. The only way I could see to fix it was to try deleting the entire list of thousands of messages in the archive and then archive them again. But trying the delete resulted in this massive download that I can't turn off. Does anyone know how to stop the bubble machine? Why should a delete of a range of messages on the server result in a huge download?