Hello. I am running Thunderbird (not sure which version) on Windows 7 to access my email on my laptop. My email account is with British Telecom (BT) who use Microsoft 365 (operated by 21Vianet). I have been told, rather late I think, that my Domain Name emails (which comprise the majority) will now only work after 31 October 2022 if I have OAuth 2.0 authentication rather than POP. I tried changing the server security setting on Thunderbird to OAuth2 but when I tried to access my email I was told that OAuth2 would not work with the server and I should change back to Normal password. I am not sure if the latest version of Thunderbird will work on my operating system, although the current version offers OAuth2 as a security verification. Is there something I can do to continue getting my email via Thunderbird rather than using the cumbersome Outlook. I use Outlook on my mobile and assume this will work when the changes take place. Maybe I am missing out something in the Settings. Thank you, best regards Denis