I'm transferring to a new computer and have installed 115 for the first time I can successfully transfer my profile over - and on the first run, my imap emails (outlook) are present and correct. However, when I close the app and restart it, they've all disappeared. The account is still there but all the emails have gone. (Inbox, outbox, drafts, deleted, etc... all gone) Taking a look in my profile folder, the drastic size reduction of the files contained in the imap-mail.outlook.com folder suggests that they have been erased. I've tried numerous times and the same thing always happens. Local Folders are unaffected. I have not yet given 115 permission to access internet (but I don't see why that would cause what I am experiencing.) EDIT: Having viewed another question on here (from someone with the same issue,) it seems that the messages are not being erased and can be restored if I delete the folderCache.json, session.json, xulstore.json files every time before starting Thunderbird. It's still a significant issue.