What is the authentication method for the incoming and outgoing servers? It should be OAuth2, and when you see the OAuth window to allow access, enter the regular account password.

How do I find that?

All I can see is: outlook.office365.com and outgoing server: smtp.office365.com

Set the authentication method in Account Settings, Server Settings (for the incoming), and in Outgoing Server (SMTP) for the outgoing server, Remove any entries for the account from Settings/Privacy & Security, Saved Passwords, restart TB, enter the account password in the OAuth window when asked to allow access.

Set the authentication method in Account Settings, Server Settings (for the incoming), and in Outgoing Server (SMTP) for the outgoing server, Remove any entries for the account from Settings/Privacy & Security, Saved Passwords, restart TB, enter the account password in the OAuth window when asked to allow access.

I get this error: The IMAP server outlook.office365.com does not support the selected authentication method. Please change the 'Authentication method' in the 'Account Settings | Server settings'.

I am using a hotmail.com account so not sure if that is the issue. Also whenever I remove the server domain it says I need to have a domain in. Are you able to provide screenshots of what you mean?

I believe outlook.office365.com just started requiring OAuth2.

See the attached pictures for the incoming and outgoing settings. State if you use a VPN or non-MS antivirus.

Sorry for the delay, I did what you said and wanted to test it for a bit.

Can confirm it's finally working. Thank you all for your help. I appreciate.

It is not available in my version of Thunderbird as an authentication method.

It is not available in my version of Thunderbird as an authentication method.

You should update from 68 to 78, 78 to 91, then 91 to 102. Turn off autoupdate if you wish to stay on 102 for the time being.

https://archive.mozilla.org/pub/thunderbird/releases/78.9.1/win64/

https://archive.mozilla.org/pub/thunderbird/releases/91.13.1/win64/

https://archive.mozilla.org/pub/thunderbird/releases/102.15.1/win64/

You might be able to stay on 68 using an app password with normal password authentication, but upgrading to at least 102 is recommended.

Done all the upgrades, still same problem! Is it the fact that I use % in the password as changing it to OAuth2, made no difference? It used to work, now it does not. The information on outlook says use Server name: smtp.office365.com Port: 587 Encryption method: STARTTLS Server name: outlook.office365.com Port: 993 Encryption method: TLS

No mention of OAuth2. Still getting failed password, please retry message on only one account ( the one using %), the other downloads messages OK! Microsoft insists that you use one of these non-letter symbols as part of the password.

It needed a exit from thunderbird and restart to make the password work!

Using OAuth2 creates another problem! Writing emails is disabled, if cookies are disabled on your default browser! So I switched back to normal password and it works again.

I have the same issue. After I upgraded Thunderbird, I have hotmail/outlook password boxes appear over and over. It happens when I first open Thunderbird. I enter in the passwords for each. Later, it asks all over again because Thunderbird keeps searching for new emails. I am using the 115.3.2 (64-bit) version of Thunderbird. It won't let me get to Thunderbird unless I enter every single password again. OR, if I click on the X in the upper right-hand corner of the Hotmail/Outlook password box. One of the images shows what time emails came in. It's odd. I don't enter any password in the Hotmail/Outlook password box but I still receive the emails.... I attached some of the images I see from my Thunderbird What do I do to stop this from happening?

Two comments: 1. I found that the password manager does not update until you exit Thunderbird, and run it again. Then the password you entered will be used. 2. Using OAuth2 is NOT NECESSARY. If you have cookies disabled on your default browser it will not work. So go back to your normal password selection in Thunderbird. Both of these worked for me. 3. Also I get the error sometimes that two Thunderbird Programs are running and one of them is not responding, you need to close all of them down first before the passwords work again!

I was using DuckDuckGo as my default browser. I wonder if that was causing the issue. I just changed my default back to Google Chrome. I will see if that helps.

As noted above, I changed my default browser back to Google Chrome. I restarted my computer. The pop-ups are still happening. It didn't make any difference.

The important point is are Cookies blocked? AND you need to use Normal Password on the Thunderbird options.