Okay, I'm setting up an email account, have just signed in with Google, Thunderbird is going through it's Mail Account Setup and it's Checking Password! I'm looking at a fresh T'bird install, but there's nothing in the left side pane, meaning no local folders so, I think, I'm unable to confirm the outgoing server. Interestingly, or maybe not, each time it does an update it asks me to restart T'bird.Įvery time I hit the 'Restart Thunderbird' button, I soon get a Thunderbird error report as the prog has failed to shut down correctly! Just reinstalled Thunderbird and waiting for it to update to version 52.9.1, via 45.8.0 If still no go, uninstall Thunderbird - delete the entire Thunderbird folder in %appdata%/roaming and %appdata/local. Look for a prefs.js file, and rename it to prefs_old.js. I just realized in my earlier instructions, I only had you delete the Profiles folder. Make sure view hidden files are enabled, and see if there are any entries in the %appdata%/roaming/Thunderbird folder: If it is in online mode and still giving the same error Just to double-check, is Thunderbird set to work Online - File -> Offline -> Work Online

Thunderbird gmail oauth2