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Re:New in Thunderbird 78 by abdullahkhalids on Thursday September 17, 2020 @06:13AM (#24502858)
I am using TBSync for Office 365. It only works one way. Events in my O365 calendar show up in my TB calendar, but not vice versa.

RSVP doesn't also work right now from the TB calendar. Author claims he might fix it by the end of the year.

Re:New in Thunderbird 78 by jaster on Thursday September 17, 2020 @11:21AM (#24505729)
Thanks for the recommendation, I just tried it and it seems perfect!

Contrary to your experience, I was even able to create events from thunderbird that would show up on O365. They only show up on sync however (which does not seems to be automatic, only on timer). Maybe that's the reason why it did not appear to work for you?

Re:New in Thunderbird 78 by abdullahkhalids on Thursday September 17, 2020 @01:00PM (#24507074)
There might have been updates. I haven't tried in a while - I have to use the Meeting Scheduler in O365 to set up any meetings that I do.