I had some weird problems with Thunderbird in which it did not let me view any emails. A blank window would open with just the title of the email, the actual body was not there. So to remedy this problem, I deleted the account from Thunderbird and tried to re-add it. Now it is stuck at "Checking Password". You can check the attached image. What can I do ? I am also not able to delete the "Outgoing SMTP(Server)". Thanks.