Hi everyone. Thunderbird has (quite unsuccessfully) been updated today. When I opened Thunderbird again, all that was left was the INBOX file and it was empty. I checked the contents and it said "zero files". The SEND, JUNK and DRAFT have been deleted too. When I checked the files on the C drive, the INBOX, SENT, JUNK and DRAFT files had also disappeared. There was only a series of .msf files. Whenever I open Thunderbird, a new .msf file is created for just a few .ko. The mail box is on an IMAP server, and I can still see the messages on my webmail. Strangely enough, I have a second email address also in Thunderbird, but on a MAIL server, and nothing was impacted by the update. On a second computer, the update hasn't deleted the files, and the files in the C drive are still visible, but I can no longer get new messages. The day before, in LOCAL FOLDERS, some messages had become invisible in a specific file, but are supposedly still there, since Thunderbird says they are. What can I do to get all my messages back ? I couldn't find any info about such a major Thunderbird crash. Thanks for your help !