Microsoft has instituted the following changes:
- Deprecated basic authentication (username/password), and is instead now requiring OAuth authentication.
https://support.mozilla.org/en-US/kb/microsoft-oauth-authentication-and-thunderbird-202
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I always get a password popup when I configure my outlook account for IMAP.I am sure that my account password is correct and I can log in normally on OWA.The replacement device also has this problem.
Microsoft has instituted the following changes:
https://support.mozilla.org/en-US/kb/microsoft-oauth-authentication-and-thunderbird-202