In running Thunderbird 139.0.2, there was a glitch and all my messages in my inbox disappeared. It then reconnected to the server and started redownloading all the messages. However I have >100000 messages, so this takes a long time. Several times, it has glitched again and all the messages again disappeared. Based on some on-line suggestions, I turned off "compacting folders" and it now seems a bit more stable. However, it is still slowly redownloading my large number of messages. What is the best way out of this situation? If I upgrade to the latest version, will it still need to redownload all the old messages? Are the messages really gone, or is there some file that is corrupted that I could fix so it would find the messages? Thanks for any help.