Rated 5 out of 5 stars

per Emmanuel ROECKER el des. 22, 2018 · enllaç permanent

I created a new version (forked and updated original source code),
it works with last version of Thunderbird 60

It's named "Open Google Calendar"
https://addons.thunderbird.net/fr/thunderbird/addon/open-google-calendar/

Feel free to send any amount via Paypal :)