Periodically many accounts, whose passwords I had stored, are found to be unreachable, and even upon re-entering them, they continue to fail.
I am forced to delete the account and recreate it, in order for it to work again.
Email accounts from various providers, including outlook.
I use thunderbird because I have many accounts, so much so, I log into the web interface first!
Also, once the endless error messages are closed, nothing is left to indicate which boxes are synchronized and which are not!
