I have found a simple solution: when creating a new account, DO NOT include the password while Thunderbird is setting up the account. Wait until the account has been created and then enter password when prompted.

Hi, already i check this thing but after that account was created i insert the password but i received "Login to account failed" I attached a photo. PS: On the other PC with an older thunderbird version this i can to add this account.

Your earlier screenshot shows user id as 'office', but normally, the user id also requires the domain name, e.g., office@xyz.com. Please try that in server settings.

Thanks! After a lot of testing methods i forget the domain for username but the problem was solved creating the account without password and then entering the password

Hello,

Tried the suggestion to enter first name last name, email address and omit the password; TB found info. When I entered my password it still said "incoming server already exists." What is the next step?

Close the account close thunderbird start thunderbird enter account info without password

That typically does it.

Thank you for your emails. I did as you suggested, but all I get is "incoming server already exists."

Are you entering account id including domain name, e.g. xxxxx@gmail.com? This 'incoming server...' issue is being investigated as a bug, but all previous users I've been in contact with used those steps to get by it.

My problems finally solved, but thanks for your email.