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> no support for O365, unless you pay for a 3rd party plugin

It seems that Thunderbird supports O365 oauth natively now, including access to calendars.

I know I had to use some plugins in the past, but now, it just works.

Yeah, you can use Thunderbird with Office365 authenticating with OAuth2.

Hmm, I literally just double-checked before posting (with the beta version, too), and it still says it needs a plugin? Maybe I need to look a bit closer.

at the very least, check which version you're on. The auto-updater is one of the parts that's unreliable.

* https://blog.thunderbird.net/2023/01/important-message-for-m...

* https://office365.mcmaster.ca/reconfigure-mozilla-thunderbir...

If you've constantly upgraded over the years, try creating a new account or even reseting your profile. Perhaps there are/were some 'stale' settings that are messing things up.

I definitely used Thunderbird for an O365 account that required 2FA and so had to use OAuth, back to.... 2021 at least, I think. Though I think you might have had to know to change the auth method to OAuth to get it working, at least at the time.

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