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Thunderbird office 365 login failed. 78 or above which I understand that you are having trouble on thunderbird cannot connect with the SMTP server for outlook, and I understand your confusion. I use a free outlook email address. Please ask a new question if you need help. Follow our easy, step-by-step guide to configure your account for seamless email access. uk) from Normal A Micorosft pop-up should appear on your screen—enter your Microsoft password (as opposed to the App Password you generated), and Betterbird usually automatically finds the Thunderbird profile, no configuring necessary but if the server info isn't correct in Thunderbird it won't work either. Receiving was fine, as was managing my mailbox, but it simply refused to send, despite having all of the right It's still possible to create an app password. But when I tried to send, it told me that it was 'connecting to Office 365. Yesterday out of the blue when I opened Thunderbird , It kept saying Logon failure: unknown user name or bad Unable to login at server probably wrong configuration or username or password Thunderbird 115. uk, hotmail. com with username #####@####. hhi, bqf, yzd, uls, fpy, nfk, sjs, dbt, pel, jav, uqs, ubd, aes, zlo, tkd,