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от catalin Окт. 6, 2016 · permalink

Ref: Flawed but necessary Rated 2 out of 5 stars
by MarkUK
I had the same problem. It would ask me to authenticate everytime I would open thunderbird.
The solution: When creating a new google calendar don't forget to create a new session. After you select new calendar > on the network > google calendar it is requesting to select a session or create a new one. Just input your google e-mail. Solved ;)