Using Windows 10. After Thunderbird updated to 78.X it did not find my e-mail accounts (I was using 2) and it did not find my calender (lightning was working fine before). My address book is present. My profile folder is 10.7GB large, so I think the mails are there somewhere, but in no way can I make TB see them. I made a new profile and linked my profile folder to it: nothing happens. I copy-pasted it to a new profile folder: same thing. I did unhide the complete profile folder: no change... HELP!