Unstable, slow, but usefull Rated 3 out of 5 stars

Sometimes it crash the Thunderbird and do full sync every time.
Full sync is significally slow, thunderbird becomes unresponsive

Doesn't appear to be working Rated 2 out of 5 stars

Was running fine on Thunderbird v46, but quit working with Thunderbird v47 and Lightning v49b2. Doesn't seem to be working with Google Calendar Provider v2.7.

Will have to look for and submit a bug report for error# 0x80570015 when I have some more time.

Dosn´t work on Windows 10 Rated 4 out of 5 stars

wery good add-on. I have Windows Vista and Thunderbird 45.2.0. The Syncronisation ist very good. If I try ist with Windows 10, Thunderbird works for a long time and don´t stop. Can any Body help me.

Very good, but can't handle more than 5 calendars Rated 4 out of 5 stars

Works well and is quite useful. I have been using the add-on with 4 calendars for some time. However, I tried adding 3 more calendars today and it caused Thunderbird to hang. Only way Thunderbird recovers is by force quitting, starting in safe mode, removing those calendars and restarting.

Work very good Rated 5 out of 5 stars

Simple, pure, nice and just works. Now I can sync my Google Calendar on mobile phone with Thunderbird. Very nice.

Provider for Google Calendar- small gitches Rated 4 out of 5 stars

I'm over-all pleased with the provider for Google calendar.
Problems I am having is with the sync and it is the latest version and the reminders from my calendar cannot be dismissed.

Very good if you do not have more than 2000 entries in a calendar Rated 4 out of 5 stars

It is a nice add-on that helps me to synchronize several google calendars to thunderbird.
There is only one (quite big) problem: it stops synchronizing the newest events when a calendar consists of more than 2000 entries.

Thunderbird 45 Rated 5 out of 5 stars

I had the same problem as the last couple of reviewers, the upgrade to Thunderbird 45 caused all of my Google calendars to no longer connect at all. After a little investigation I noticed that this plugin has not been automatically updating, it was still on version 1.0.2 I think. So after manually updating this plugin to version 2.7 and restarting Thunderbird, all my Google calendars are back and everything works properly. Hopefully this will help someone else with the same issue.

Works great for syncing two Google calendars (work and personal) into one Lightning calendar view Rated 5 out of 5 stars

Once I realised that appointments were being set in the "Home" calendar by default, and that this was not what I needed, it all worked smoothly.

When setting an appointment, in the event dialogue there is a "Calendar" drop-down where you choose the calendar in which you want the event to be recorded. I was not paying attention to this; it was set by default to Home, and was therefore not being sent to my Google calendar. This caused me some frustration as I initially thought there was a fault with the synchronisation because the events were not appearing in Google but I then realised there was nothing to sync as I was actually setting them on the local Lightning "Home" calendar only.

For my purposes, I have deleted the "Home" calendar altogether so now all events will at least be recorded in one of my Google calendars if I forget to select one. This works fine for me and I now have an integrated calendar in which I can view and manage my personal as well as my business appointments.

issue with Google Calendar event permissions not carrying over to Thunderbird Rated 2 out of 5 stars

We are using a new Google Apps account. In testing, a calendar was made in a master account (we'll call this Account A), so it is the owner, and shared for all within the organization. Events were added and when the Google calendar is added in another email account (Account B) and only has permissions to view the event. Using a browser, there is no ability for Account B to delete the event at all. This is what is supposed to happen. However, after syncing the calendar and the event is visible, when it is deleted from Thunderbird for Account B, it is also then removed from Account A which created it and is the owner of it. This should not be allowed for users. Only the owner. I've checked the forum for other such questions but found nothing. Hoping someone else has also experienced this and found a fix. Added the question to the forum but no answers forthcoming yet. Otherwise, the adding of a calendar and syncing all work as expected.

Thunderbird 38.6.0
Lightning 4.0.6
Provider for Google Calendar 2.7

Calendar Refresh Interval? Rated 4 out of 5 stars

Excellent Add-on. Makes Lightning work with Google Calendar.

There seems to be a limitation when setting the Sync Refresh Rate. It cannot be set any faster than once every 30 minutes.

I don't think this is a limitation of Lightning. Seems like it may be a limitation of what the Provider will permit.

Is that correct? Is there some way to customize this?

Many thanks

Item changed on server Rated 4 out of 5 stars

Great plug-in, very useful.
I do struggle with what seems to be a bug though: Frequently I get a modal window complaining "This item has recently been changed on the server. Submitting your changes will overwrite the changes made on the server". I am offered to submit or discard my changes, but regardless of my choice the error persists. Is anybody else experiencing this?

Enter correct address ... OS X Rated 5 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.