Used to work great -- too slow now; I gave up... Rated 1 out of 5 stars

I had been using this fine for several years.
Recently, Provider for Google Calendar caused Thunderbird to become slow and unresponsive.

Switched to CalDav (see Rendered TB Slow, Uninstalled Rated 3 out of 5 stars
by giftpilzchen on August 4, 2015)

I'd prefer to use the Provider as it's much better for integrating with multiple Google calendars. Maybe the performance problem will be resolved some day and I can use this once again.

No Longer communicating from Lightning to Google Calendar Rated 5 out of 5 stars

I love this add-on but since Lightning 4.0.2 (at least that's when I noticed it) You can create and event in lighting and it show on your calendar in lighting but it doesn't actually create the event in google calendar (if you go to the actual google calendar your event isn't there). However if you create and event in google calendar (actually in google calendar not Thunderbird) you can see it fine from Lightning. Please fix. Thank you in advance.

Bug with attendees since Lightning 4.0.2 Rated 5 out of 5 stars

Since Lightning 4.0.2 i can't invite attendees.
Event is ok but only on selected calendar, no attendee.
Thank you.

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

Buggy & Superfluous -- use iCal option Rated 1 out of 5 stars

The set up always got stuck after entering the name for the calendar. Clicking "Next" did nothing and no Google authentication window opened up.

In the end there is not need for the Add-On. Lightning has an iCal option and on Google Calendar you can get an iCal Location (green iCal button from settings).

That works without a problem -- so further Add-On needed.

wasn't working... now its fixed!!! THX Rated 5 out of 5 stars

Been a huge fan of TB for many years, but as many have posted here, I started having lots of issues and freezing since last year due to Google Calendar Provider addon. Tried many things for several months, resisting the idea to abandon TB. Was just about to give up to Outshitlook until I did what "giftpilzchen" posted a couple posts down on the post titled "Rendered TB Slow, Uninstalled on August 4, 2015" and reinstalled all the calendars manually. Works like new, seconds to start...
Sensei giftpilzchen, THANK YOU

works partially Rated 2 out of 5 stars

Used to be a big Thunderbird user. Now coming back and hoping things work the same. Unfortunately not. Provider works partially by syncing a few calendars in Google, but not my primary calendar. tried everything I could think of and did a search to find solutions but no luck. and don't have any more time to play with it. so, although definitely worth supporting this developer (if it worked), I'm moving on to find a tool that works easily. oh the joys of software..

Good idea but problematic Rated 2 out of 5 stars

I desinstall de add-on because the solution is 2 post later!!

"par giftpilzchen le August 4, 2015 "

It works very good now, compatble with the new version of bierdiesync, all what i need!

Good Idea, Extremely Buggy Rated 2 out of 5 stars

Very good extension IF it wasn't so buggy. I had to uninstall it as it slowed Thunderbird down dramatically.

Rendered TB Slow, Uninstalled Rated 3 out of 5 stars

This was a great add-on until September 2014. Since then, I constantly had synchronization problems. No tweak, update, or reinstall helped to solve the problems. It took ~5 minutes to start up Thunderbird because all the reminders would pop up, remove themselves, disappear, pop up again etc. On Windows, I wasn't even able to import the calendars anymore because one window in the import dialog remained blank. Needless to say that all three software components were up-to-date versions.

I am really sorry for the developer but I had to uninstall the add-on completely. My solution to the problem is now to install the caldav calendars myself manually:

Create new calendar on network -> Caldav
Use this address and replace "your-email-address" by google email address for main calendar and by the calendar ID (under settings in brackets) for any other calendar.

Type in PWs and follow 2-point authentification. Done!

Takes a bit of legwork, but ended all my problems, and TB starts up in a few seconds now.

P.S.: I had to put calendar.icaljs=false in the config editor to make caldav work.

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

needs better performance and reliability Rated 3 out of 5 stars

This add-on seems like a good start but it has some serious issues with large calendars.
When downloading calendars, thunderbird becomes very slow (almost freezes to unusable degree).
This is maybe mostly lightning bug, but it starts showing numerous missed reminders from previous days (I wonder why is this the default), I close the window but it appears again and again in the foreground no matter what other program I'm looking at. And clicking on dismiss the missed events does not help.

When calendars are too large they may never be downloaded. In status bar I see "downloading ... from xxx". For example one calendar with 1000 events, it could only go to around 960 and then stop and try again. Perhaps there are some resource limits imposed by google. In any case why start downloading the whole thing from the beginning? If it could recover and download only events that failed to be downloaded, then that would be much easier done. Or maybe limit retrieval to say 50 at a time to avoid hitting connection limits.

In any case, removing the big calendar which fortunately is not so important to me + disabling missed events notifications in lightning settings, made the thing work for the time being. So giving 3 start. I hope developer will improve reliability and performance and this add-on will be worth a lot of stars.

Great app as long as you don't need to read email or look at your calendar Rated 3 out of 5 stars

I installed this program expecting it to lock up my firefox like it does on my other computers, and I wasn't disappointed. I have several google calendars with years of reoccurring appointments, some of them shared with others, and as soon as the add-on synchronizes with my google account, firefox starts to lag. The next time I start firefox, within about 5 seconds, the entire program locks up and gets into a wonderful and gratifying loop of asking for my password and telling me that there is an unresponsive script. This happens on both windows and linux, so when I decided to move to another computer, I said to my self, "Self, you should install that google calendar sync add-on into this computer so you don't have to look at your calendar or read any email!". Great job guys, keep up the good work! I wanted to use my phone for the calendar app in the first place, who needs a desktop anyway?

Renders Thunderbird unresponsive Rated 1 out of 5 stars

Unfortunately completely unusable as it renders Thunderbird completely unresponsive. Had to uninstall.

aktualisiert nicht immer Rated 4 out of 5 stars

Ich bemerke immer wieder, das es Probleme mit Serienterminen gibt. Wenn ich einen Termin aus der Serie lösche oder verändere, wird er nicht aktualisiert.

Unresponsive Script Errors Rated 2 out of 5 stars

Since the new version of Thunderbird came with Lightning pre-installed, I figured I'd give it a try, with the hope that I'd be able to use it to see events from my Google Calendars while offline. That desire obviously led me here...

I was able to conveniently setup access to a few calendars from my Google account.

But as soon as I subscribe to the calendar I share with my significant other, which contains a couple hundred events (mostly her daily work schedule for the next few months), I start getting repeated loops of Unresponsive Script Errors and Thunderbird becomes entirely unusable. The only way to rectify this was to kill the Thunderbird process, restart, and race to unsubscribe from that calendar before it all locked up while synchronizing.

Cannot accept email invitiation Rated 4 out of 5 stars

Not working "No writable calendars found, check properties". Provider (Gdata) and Lightning installed (cleaned up and re-install didn't help).

Although I can write bidirectional calendar events to calendar manually BUT cannot accept via email invitation.

Unable to solve and only workaround is to save calendar event in email invitation (ICS) to desktop and use import to add to calendar.

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

Suitable for small calendars, personal use Rated 2 out of 5 stars

I can use this extension only for my personal calendar with a limited amount of recurring events. The work calendar uses Google Apps and contains a huge amount of events, mostly are recurring ones (daily standups and weekly reviews, plus the ad-hoc meetings... every day is filled). This extension unfortunately doesn't scale very well and occasionally I get unresponsive script alerts that freeze Thunderbird, preventing me to use email and calendar productively.
Sadly, there isn't anything better on Linux at the moment.

Super App - aber leider teilweise lange Verzögerungen - vermutlich wegen vieler Einträge und mehreren Kalendern? Rated 4 out of 5 stars

Die App ist spitze und ich möchte sie gerne weiter benutzen und empfehle sie prinzipiell auch weiter.

Allerdings hätte ich eine dringende Bitte zur Weiterentwicklung. Vermutlich, weil ich mehrere Kalender mit mehreren Leuten gemeinsam nutze und eine sehr hohe Anzahl an Einträgen habe, kommt es immer wieder zu massiven Verzögerungen beim Synchronisieren.

Leider steht dann nicht nur der Kalender sondern der gesamte Thunderbird still. Das ist sehr lästig und daher bitte ich darum, lieber Philipp Kewisch, ob das behebbar wäre?

Danach würde ich die App uneingeschränkt empfehlen und zahle auch gerne 10 Dollar dafür.

Danke und viele Grüße

Google Calendar Reverts to Read-only Rated 5 out of 5 stars

This add-on solved a major problem I was having with being able to edit my Google Calendar (add events, dismiss reminders, etc.) using Lightning v. on Thunderbird v. 38.0.1. Installed this add-on and, BINGO, I now have two way communication with my Google Calendar. Awesome!

not usable for corporate Rated 2 out of 5 stars

This addon is not usable for corporate environments. If you have many calendars and something about 1000 entries in it the addon will freeze your thundebird.

Calendar freeze Rated 4 out of 5 stars

Like some people here, I had problems with this plugin since some weeks. After some test, I realized that the "birthday" calendar was the probleme. I desactivated it but it would be great to solve this probleme.