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Three days ago, my Thunderbird stopped connecting to my me.com email account.

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The error message says the password is invalid. To double check this, I logged into my webmail on both a Mac (using Safari) and PC (using Firefox). Both computers were able to connect using the password. I have updated Thunderbird. I deleted the email account and reinstalled it. I have the email account on 3 devices: iPhone, MacBook Air and PC. The email account on iPhone is working normally without any password problems. The PC and MacBook Air, both using Thunderbird, claim the password is wrong. I installed the email on Mac Mail and it works perfectly using the password. Thunderbird is the only program that returns a password error. Any advice?

The error message says the password is invalid. To double check this, I logged into my webmail on both a Mac (using Safari) and PC (using Firefox). Both computers were able to connect using the password. I have updated Thunderbird. I deleted the email account and reinstalled it. I have the email account on 3 devices: iPhone, MacBook Air and PC. The email account on iPhone is working normally without any password problems. The PC and MacBook Air, both using Thunderbird, claim the password is wrong. I installed the email on Mac Mail and it works perfectly using the password. Thunderbird is the only program that returns a password error. Any advice?

Chosen solution

As of June 15 Apple requires 2 factor authentication. In order to use a 3rd party client like Thunderbird you have to generate an app specific password and use that instead of your normal password.

Apple instructions. https://support.apple.com/en-us/HT204915

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Chosen Solution

As of June 15 Apple requires 2 factor authentication. In order to use a 3rd party client like Thunderbird you have to generate an app specific password and use that instead of your normal password.

Apple instructions. https://support.apple.com/en-us/HT204915

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Thank you. This worked, however, it was so confusing that I had to call Applecare to have them walk me through the process. I had to fix Thunderbird on two separate computers.