Enter correct address ... OS X Rated 4 out of 5 stars

I tried to configure Provider for Google calendar on my Thunderbird installation (system OS X El Capitan). When I go thru Create New Calendar -> On the Network -> Google Calendar -> Locate your calendar and type my email address he say I have to enter correct address ... I suppose program expect URL link... so i cannot log when I enter my email address ! and configure it... Please help.

No, the URL is no longer required. Please enter your email address.

Awesome Rated 5 out of 5 stars

Makes Thunderbird/Lightning even better!

I hate using Local Calendars and this has fixed it! Thank you so much!

Works great but. Rated 4 out of 5 stars

Works great with google calendar BUT repeating events created in Thunderbird do not sync to google. Repeating events created in google sync perfectly back to Thunderbird. Any explanation?

Provider - Unable to install - Unverified Rated 3 out of 5 stars

This looks like a great add on. I could really use this but unable to install due to the add on being unverified by Mozilla. Any plan to have it verified?

Works great, minor nits Rated 5 out of 5 stars

This add on is a really useful tool. I made a contribution to support it.

Minor complaints:

Under "Create New Calendar -> On the Network -> Google Calendar -> Locate your calendar", it says "Please pick an existing session or enter your email address to create a new session". Most people won't be able to figure out what a "session" means here. Basically, it means enter the email associated with the new Google calendar you're setting up (strictly speaking, you're setting up a new Thunderbird calendar connection to your existing Google Calendar, but whatever)


Hi Ben, thank you very much for the contribution and the suggestion. I agree it would be good to get this technical term out of the extension and it is easy to describe differently. It may take a bit though, because the extensions is translated into many languages.


Love it, best calender app around Rated 5 out of 5 stars

It works perfectly reading and writing to my Google calendars. With Lightning it's the best calendar app around.
- great you can scroll down smoothly, not just a month at a time, which is only partly implemented in Apple's calendar and not at all in others
- you can see the time on the event, again can't on many others
- can print out a month's events

Thank you! keep it up

Very helpful guide - Worked for me! Rated 5 out of 5 stars

The guide is a tiny bit outdated I guess, because a couple of the final steps were different. But it was not hard to guess the right selection. All in all very straightforward. It took me about 5min. to adjust the settings. Thank you!

Slow and unresponsive Rated 1 out of 5 stars

After over a year the add-on still slows down Thunderbird to almost stand still.
After each update it requires to authenticate each calendar again. Which is quite annoying.

This user has a previous review of this add-on.

Love it, but ... Rated 2 out of 5 stars

... unfortunately makes my Thunderbird almost unusably slow. This was an issued about a year ago, which I had been able to fix by installing a pre-release, but now the problem came back. I wish this could be alleviated.

This review is for a previous version of the add-on (1.0.4).  This user has 2 previous reviews of this add-on.

moved half my meetings by an hour, made them public Rated 1 out of 5 stars

I had high hopes, but after installing this, half my meetings were changed as follows:

* moved forward in time by an hour;
* calendar-default visibility settings were replaced with "public";
* repeating calendar entries were reconfigured as a series of exceptions.

This review is for a previous version of the add-on (1.0.4). 

I'd appreciate if you could contact support on this issue. The time moved forward should be a display issue fixed in 2.7, the repeating entries thing only happens if you make changes to occurrences and is related to Lightning, and the visibility thing sounds strange to me.

Marvellous, thanks a lot Rated 5 out of 5 stars

Works fine! One of the best calendar add-ons because win 10 calendar does not (yet?) show past events, in the android world it is, as far as I know, only Calengoo which presents all (!) events from the Google calendar.
Downloaded Thunderbird, Lightning and thirdly this "Provider for Google Calendar".
I'm not thee expert in all these things, just followed the instructions here:

Result: Thunderbird loads fairly quickly, only the first search-through took 30 sec with five years of events (average one entry a day). The whole thing took me five minutes.

This review is for a previous version of the add-on (1.0.4). 

Only 1000 first events sync - Would be better to start with the future events than older ones Rated 4 out of 5 stars

Thanks for this module
You wrote on October 5, 2015 ("Wrong" - response to "unusable with large numbers of events"
I have the same problem : the sync of 1000 events does the sync of events in my agenda from 2007 to 2011. But nothing after 2011, the 1000 first events are in TB but not the current ones.

You said "There is an advanced option to change the batch size" : how is it possible to use it ? I would set 3000 then.

You said also "Once the initial synchronization is done, the synchronization token is saved locally and all future synchronizations are incremental: only changed events are downloaded. So, let me guess, this is exactly how synchronization software should work? Yes, I thought so."

Then as you guess "the case is probably that the initial sync is not complete, hence the token is not saved on shutdown and next time you start up, it attempts to start over. Please give it some time." How can I know if the initial sync is complete or not ? In the bottom bar, there is written "synchroniszation finished at 19:18:14, but my last event is june 20th, 2011.

Thanks a lot

This review is for a previous version of the add-on (1.0.4). 

Extremely slow Rated 1 out of 5 stars

This add-on makes the calender extremely slow to load and to browse through.

This review is for a previous version of the add-on (1.0.4). 

Severe slowdown Rated 5 out of 5 stars

Update: unsubscribing birthday calendar helped tremendously. I've updated my rating to 4/5 stars. It would have been 5/5 if it wasn't for such an work-around.


I'm all of the sudden experiencing severe slowdowns in TB. I've been using this add-on for quiet some time and have been happy with it, but since yesterday, TB now needs up to 2 minutes or so, because I can actually use it. While in TB and writing a mail, I occasionally experience slowdowns here as well. Could be syncing related.

I've tried disabling all calendars, but that didn't help anything. Only by disabling this add-on I can access TB normally.

This review is for a previous version of the add-on (1.0.4). 

Fully automated, works great. Rated 5 out of 5 stars

This review is for the newest versions at the time:
Thunderbird 38.3.0
Provider for google calendar 1.0.4
The setup was very straightforward. (you have to have the Provider addon installed and enabled)
File->New->Calendar->Network Calendar->Enter gmail address->Enter gmail password->Choose Calendars to sync

That was it, you are ready to go.
Avoid older instructions in thunderbird support using xml instructions and such, it is not needed.

This review is for a previous version of the add-on (1.0.4). 

Works pretty well, I wish the full sync every time would be fixed Rated 4 out of 5 stars

Philipp thanks for your work on this Add-On, it makes checking my family google calendar very convenient. One comment on the sync issue which I think has been brought up in other reviews: Mine does a full sync of 756 events each time I start TB. Basically I wait until that sync is complete (about a minute), then TB works just fine. Question - you mentioned that a "token" gets saved on your PC after each full sync so it knows to sync only incremental changes. I have let the entire sync operation complete. How do I know if this token has been saved? Or is there some other configuration option I'm missing (perhaps saving cookies?) Thanks again.

This review is for a previous version of the add-on (1.0.4). 

unusable with large numbers of events? Rated 4 out of 5 stars

I have been using the extension for a while. I really need it but I have issues related to syncing too. It happens very frequently and freezes Thunderbird for a while. I have to say that I'm using many calendars at the same time, and that I use to delay many alerts. As I see that syncing is a complicated issue, I 'm thinking about a workaround: having a button that turns syncing on/off on demand! It would be wonderful!
Thanks for the extension.

This review is for a previous version of the add-on (1.0.4). 

Rated 3 out of 5 stars

Multiple users share a calendar through one account. However, users must log in again ( within 1-3 weeks ) using the Google popup window .

This review is for a previous version of the add-on (1.0.4). 

Work, but not quite Rated 4 out of 5 stars

It works fine, except for one thing. The login isn't remembered. Every time Thunderbird is started (effectively once a day for me) I get two Google login screens (I assume once for calendar, and another for tasks, althouth it's the same account..)

Otherwise, good plugin.

Thanks for the quick response!
Seems to have worked. Let's see for how long, but for now, somehow, re-adding the calendar fixed it. I restarted TB and it doesn't ask for my login again. I'll increase my rating ;)

This review is for a previous version of the add-on (1.0.4). 

Can you try unsubscribing from calendar and tasks lists, then re-subscribing and making sure you enter one email address when prompted? I've heard of this issue, but I haven't been able to reproduce it.

Still slow, but not so terribly as before Rated 3 out of 5 stars

After the developers hint to disable Birthdays Calendar it is quicker, but still does not perform like it used to. I think this is related to the Public Holidays calendar which is still active and needed. I'm looking forward to the next version which hopefully resolves this issue completely.

This review is for a previous version of the add-on (1.0.4). 

Yes, there is. This may be the issue with the Birthdays Calendar. Please unsubscribe from this calendar until I release the next version. Aside from that, the first sync always takes a while, it should be fast after that.