Rated 2 out of 5 stars

Sync only occurs when restarting Thunderbird. Manually sync also does not work.
Thunderbird Supernova version 115.7.0 (64-bits), add-on version 115.0.2.
As a workaround I use the "Open Google Calendar" add-on (opens Google Calendar in a new tab).

This review is for a previous version of the add-on (115.0.2). 

Rated 3 out of 5 stars

only restart of thunderbird sync calendar. TB 115.5.2 addon version 115.0.2

This review is for a previous version of the add-on (115.0.2). 

Rated 3 out of 5 stars

Synchronization with Google Calendar ands Tasks only happens when I restart Thunderbird.

Thunderbird version 115.5.2, add-on version 115.0.2

This review is for a previous version of the add-on (115.0.2). 

Rated 2 out of 5 stars

Warning: Accepting/editing the event or dismissing reminder WILL REMOVE ATTENDEES!!! They'll receive a "Cancel" notification. Please fix that as soon as possible!

This review is for a previous version of the add-on (115.0.2). 

Rated 5 out of 5 stars

It works very well with TB 115.5.2(64b).
Big thanks to Philipp

This review is for a previous version of the add-on (115.0.2). 

Rated 1 out of 5 stars

I don't understand why we need an add-on so that Thunderbird can connect to Google Calendar, are there no in house engineers at Thunderbird to perform Google Calendar connection so that simply Thunderbird can show Google Calendar with any add-ons??

This review is for a previous version of the add-on (115.0.2). 

Rated 1 out of 5 stars

Respectfully, the current state of the plugin renders it unusable.

It started out ok, but a as time went on, I started to get more and more notifications from my meagre set of events.

Today, I spent ~10 minutes dodging focus-stealing notifications to get to the Thunderbird addon manager to disable the extension.

It's nice to have the calendar sidebar in Thunderbird, but I'll have to do without.

Thunderbird 115.4.3

This review is for a previous version of the add-on (115.0.2). 

Rated 5 out of 5 stars

No longer needed by me, but very many thanks to the developer who has tried, and mostly succeeded, to keep track of changing applications and APIs for many years.
Hats off to Philipp!

This review is for a previous version of the add-on (115.0.2).  This user has a previous review of this add-on.

Rated 1 out of 5 stars

Attention! This AddOn works NOT with 115.4.x
Thunderbird freeze after intallig this AddOn.
And Thunderbird freeze after restart.
It's ahorrible AddOn. !

This review is for a previous version of the add-on (115.0.2). 

Rated 3 out of 5 stars

use to work great now it doesn't synch
need to be updated

This review is for a previous version of the add-on (115.0.2). 

Rated 1 out of 5 stars

Syncing the calendar unfortunately no longer works reliably. It only works when I manually restart Thunderbird.

This review is for a previous version of the add-on (115.0.2). 

Rated 2 out of 5 stars

Outgoing works fine but incoming doesn't. Now I either have to shut down and restart TB - or reinstall Provider for Google Calendar so it'll sync. But then it syncs only for a short period. Please fix this?! Version 115.4.1

This review is for a previous version of the add-on (115.0.2). 

Rated 5 out of 5 stars

Not perfect, but no other good and free solution.

This review is for a previous version of the add-on (115.0.2). 

Rated 5 out of 5 stars

Perfect. I synced calendars, tasks and contacts from two Google accounts. I have been using the extension for over 1 year without any problems. Thank you very much.

Perfeito. Sincronizei calendários, tarefas e contatos de duas contas do Google. Uso a extensão há mais de 1 ano sem problemas. Muito obrigada.

This review is for a previous version of the add-on (115.0.2). 

Rated 3 out of 5 stars

At the moment there are synchronization problems. In version 115, new calendar appointments entered via the mobile version of Google Calendar (iOS, Android) are not displayed / synchronized. With an older Thunderbird version (102.15.1) on another Windows 10 computer it still works fine. So the problem seems to have happened with the new version 115 (Supernova). The synchronization between all other Google Calendar apps (iOS, Android) works without problems. Only in Thunderbird 115, new appointments created on another device are not synced. Please fix this problem.

This review is for a previous version of the add-on (115.0.2).  This user has a previous review of this add-on.

Rated 2 out of 5 stars

The notification window for appointments can not be closed, neither for all notification nor for a specific one, it is annoying.

This review is for a previous version of the add-on (115.0.2). 

Rated 3 out of 5 stars

I have just noticed, adding meeting invitations from E-mails does not work either. A mail with a meeting invitation displays the following error: "No writable calendars are configured for invitations, please check the calendar properties". I'm sure the "Read Only" checkbox on my subscribed Google Calendar is off and I can create events there manually from Thunderbird. This is very sad.

Copying from my previous review. Using v115.0.2. It works sufficiently well with calendar events but is broken in syncing Google Tasks. Tasks created or marked completed in Google Tasks sometimes do not appear or fail to change status in Thunderbird etc. Tasks created in Thunderbird usually appear in Google Tasks though. There is a "diode" somewhere along the way.

This review is for a previous version of the add-on (115.0.2).  This user has a previous review of this add-on.

Rated 2 out of 5 stars

As many reviewers have noted, Provider for Google Calendar fails to import new events from a Google calendar when synchronizing. It will do this properly when Thunderbird is rebooted, but once it is running, the local calendar is not kept updated. I hope the developer is listening.

This review is for a previous version of the add-on (115.0.2). 

Rated 2 out of 5 stars

Worked when first updated to version 115. Now with further betas, it is unusable again

This review is for a previous version of the add-on (115.0.2). 

Rated 1 out of 5 stars

Unusable after a recent update. I don't remember Google Calendar *ever* working flawlessly with Thunderbird, especially across multiple devices. This add-on used to make it tolerable, but now I no longer get write access. That's it, for good - I'll probably have to migrate away from TB to get a very basic productivity feature. :-( (No, ICal also doesn't work. It's a mess.)

This review is for a previous version of the add-on (115.0.2).