I have confirmed that my Outlook Password is correct. I have cancelled my Outlook passwords.

Not sure what that means, and how you can cancel your Outlook password. Make sure to use your main account password, and no app password you may have created in the past.

Check the passwords Thunderbird has remembered. At the top right of the Thunderbird window, click the menu button ≡ > Settings > Privacy & Security > Saved Passwords > Show Passwords. Delete any lines starting with imap:// and smtp:// and oath2:// for the troubled account.

You'll then be prompted to authenticate again. For this to work make sure cookies are enabled in Thunderbird. https://support.mozilla.org/kb/microsoft-oauth-authentication-and-thunderbird-202

christ1, I am missing something! I have removed all the Thunderbird passwords. Cookies are enabled. I am getting my "failure" from outlook.com, shouldn't it be from outlook.office365.com"?

I am NOT being prompted to authenticate. Whats my next steps? Ed

Please post your Troubleshooting Information. At the top right of the Thunderbird window, click the menu button ≡, then select Help > More Troubleshooting Information. Press the "Copy text to clipboard button" and paste the information into your reply.

Application Basics Name Thunderbird Version 128.3.0esr Build ID 20240930164946 Distribution ID Update Folder C:\ProgramData\Mozilla-1de4eec8-1241-4177-a864-e594e8d1fb38\updates\8216C80C92C4E828 Update History Update Channel esr User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Thunderbird/128.3.0 OS Windows_NT 10.0 19045 Application Binary C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe Profile Folder (Local drive) Build Configuration about:buildconfig Memory Use about:memory Cache Use about:cache Performance about:processes Registered Service Workers about:serviceworkers Third-party Modules about:third-party Launcher Process Enabled Multiprocess Windows 0/0 Fission Windows 0/0 Enabled by default Remote Processes 1 Enterprise Policies Inactive Google Location Service Key Missing Google Safebrowsing Key Missing Mozilla Location Service Key Missing Safe Mode false Memory Size (RAM) 5.5 GB Disk Space Available 756 GB Profiles about:profiles Telemetry Data about:telemetry Glean Data about:glean

Mail and News Accounts ID Incoming server Outgoing servers Name Connection security Authentication method Name Connection security Authentication method Default? account2 (none) Local Folders None Normal password account3 (nntp) news:119 None Normal password smtp.outlook.com:587 STARTTLS Normal password true account7 (imap) outlook.com:993 SSL/TLS Normal password smtp.outlook.com:587 STARTTLS Normal password true

account7 (imap) outlook.com:993 SSL/TLS Normal password smtp.outlook.com:587 STARTTLS Normal password true

The correct settings for the incoming server are: outlook.office365.com Port: 993 User Name: <your e-mail address> Connection security: SSL/TLS Authentication method: OAuth2

for the outgoing server: smtp.office365.com Port: 587 User Name: <your e-mail address> Connection security: STARTTLS Authentication method: OAuth2

So you do need to fix the incoming server name in your Account Settings for the troubled account. Once the server names are correct, select OAuth2 for authentication for both, the incoming and outgoing server.

Made the changes on both incoming and outgoing servers. Ran one set with Oauth2 and one with Normal When Thunderbird restarted, I input password, the got "edweinman4@outlook.com got denied"

Could it be that when the restart starts, I get a TB ad automatically on my Edge Tab??

Ran one set with Oauth2 and one with Normal

I have no idea what you're talking about. Please post again your Troubleshooting Information.

clude account names (possibly identifying information) Diagnose issues Try clearing the startup cache Application Basics Name Thunderbird Version 128.3.0esr Build ID 20240930164946 Distribution ID Update Folder C:\ProgramData\Mozilla-1de4eec8-1241-4177-a864-e594e8d1fb38\updates\8216C80C92C4E828 Update History Update Channel esr User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Thunderbird/128.3.0 OS Windows_NT 10.0 19045 Application Binary C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe Profile Folder (Local drive) Build Configuration about:buildconfig Memory Use about:memory Cache Use about:cache Performance about:processes Registered Service Workers about:serviceworkers Third-party Modules about:third-party Launcher Process Enabled Multiprocess Windows 0/0 Fission Windows 0/0 Enabled by default Remote Processes 1 Enterprise Policies Inactive Google Location Service Key Missing Google Safebrowsing Key Missing Mozilla Location Service Key Missing Safe Mode false Memory Size (RAM) 5.5 GB Disk Space Available 756 GB Profiles about:profiles Telemetry Data about:telemetry Glean Data about:glean Mail and News Accounts ID Incoming server Outgoing servers Name Connection security Authentication method Name Connection security Authentication method Default? account2 (none) Local Folders None Normal password account3 (nntp) news:119 None Normal password smtp.outlook.com:587 STARTTLS Normal password true account7 (imap) outlook.com:993 SSL/TLS Normal password smtp.outlook.com:587 STARTTLS Normal password true