For the first time ever, three mornings ago Thunderbird wouldn't download emails. I went to my server and checked to find that there were emails waiting, and when I went back to Thunderbird it had downloaded. That happened again yesterday morning, with a bit of a wait before the download. This morning it happened again, and this time it's not downloading at all. What can I do? I need this info, and I'm afraid if I reinstall I may lose it all!?