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Have no idea to whom I was chatting a week or so ago, but outlook.office365.com was recommended to me as the incoming server setting for Outlook.com. Set TB that way and used it for a week or so. TODAY got a "failure to authenticate" error from TB (have had many such errors before). Went directly to Copilot, as I thought it would be the most authoritarian place to clear up Microsoft problems. It provided the informaiton below: Official Outlook.com Thunderbird Incoming Server Settings (2026) IMAP (recommended) Settings Server name: imap-mail.outlook.com Port: 993 Security: SSL/TLS Authentication; OAuth2 Username; Your full Outlook.com email address

Why this is the correct server Outlook.com, Hotmail, Live, and MSN accounts do not use outlook.office365.com .

Set outlook account incoming server to imap-mail.outlook.com and reset TB Immediately got: Mozilla Thunderbird Thunderbird Authentication failure while connecting to server imap-mail.outlook.com.

Can someone please tell what's going on?

I´m well trained employee in user support and server administration for more than 30 years now. So long for my skills... I´m the administrator of a Microsoft 365 tenant. A user asked some days age, as he can´t login into his M365E3 account using Thunderbird. I tried this scenario in my private Thunderbird profile and indeed I get an weird dialog box. I can insert my password above the first line, input above the second line is readable in clear text, the checkboxes are selectable, but no button for continue. I have examined https://support.mozilla.org/de/kb/microsoft-oauth-authentifizierung-th..., but have no success. Whats going wrong here and how can I help for debugging? Environment: TB 147.0, disabled extensions, Windows 11 pro german 01-2026 patch M365 account with MFA, (Microsoft authenticator app as primary option)

Two step verification is set up on all my email accounts via webmail - Verizon/AOL, Gmail, and Yahoo. I never set it up, and when I go in to the mail applications' prefererences it's turned off. But when I try to sign into any of my webmail sites it insists on sending me a code and I have to go back to Thunderbird and open the emails containing the verification code. I specifically go to web mail because spam folders aren't available in Thunderbird and I need access to the spam so I can turn it in to Spamcop. (Mac desktop, OS 15.7.1)

My Computer in Spain worked perfect wit my Emails until about 5 years ago when you upgraded thunderbird

Since Then it will not recognize my LOG IN passwords for both my Google email and my Plusnet email

I have had to access Gmail via there website but I like your set far better

I have had to access plus net via web mail which is very basic

Both Passwords work perfect in England

I have now set up another Computer and this time Thunderbird does recognize my Gmail password but still tells me my Plus net Password is not correct

I contacted Plus net last December from England and they confirmed that the Password is correct Have you any suggestions as to how I can solve this problem

I use windows 7 ON ALL MY COMPUTERS

Yours sincerely

Ron Goldthorpe

hi today thunderbird started showing yahoo popup login and after adding credentials i always get "something went wrong.We could not sign you in. Try again from a different device." Also popup once closed it opens instantly.

i can sign in normally from browser. thunderbird version is 147

is there any fix about this?

thanks for any help

regards

I migrated my Thunderbird installation to a new computer. The installation has 25 email accounts and is now requiring passwords be entered for each account including a couple of gmail accounts.

It was my understanding passwords would be migrated when using the export/import tool within Thunderbird. Is this not so?

Do I now need to change passwords for all email accounts? (because, of course these may have been written down years ago but cannot be located at this time. :-( ) Or, is there some way of restoring the email account passwords?

• • • side note: The migration was not seamless but mostly due to my own ignorance. When using the export/import tool from one Linux machine to another I found the following:

- Thunderbird versions must be the same on both computers - After export, file on USB drive was only accessible by root on new computer - export zip file needed to be copied to user account on new computer (from within root account) and ownership changed to [user]: -R (I imagine you could just change ownership on the USB but this seemed easier)