I see many folders with old accounts, including, etc, and don't know if these get linked to the right account, if that matters, or if this messes up something else. Move the Thunderbird folder, forcing TB to create a new profile.One of the solutions I have in mind is to rebuild the profile: I have no idea where to reset the passwords. I used chown to reset owner - no change.I tried the 40 beta version - no change.I installed Thunderbird 38.0.1 with the backup - no change.I copied the backup to the Library/Thunderbird folder and opened Thunderbird.For each test situation I copied the original or backup version of the mail, so I could go back to an identical situation if needed. Then I restored a backup of the mail from before the problems began to a temp folder. I copied the mail folder (using cp -rp), so I could mess with the folder and go back if needed. I deleted these keys to see if that resulted in something, but nothing happened. Back then I used Apple Mail, but I migrated last year to Thunderbird. The OSX keychain had some (probably older) pop3 and smtp passwords for these accounts, from last year.If passwords are deleted, I would expect to get a popup request for the password, but nothing happens.(Although this is not the issue for me, I tried it, noticed it didn't work, and it seems related so I mention it here.) When I try to set a master password, it fails.When I open Preferences > Security > Passwords > Saved Passwords, the list is empty.When checking mail, no password is asked, nothing happens.All these accounts work on other systems, so it's not related to the mailservers. I cannot download new mail anymore for all accounts, pop3, exchange or imap. For some reason my account passwords have disappeared. I have Thunderbird 38.2.0 installed on my Macbook (10.10.3 Yosemite).

Thunderbird osx