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). 

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.

/edit
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.

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.

Rated 1 out of 5 stars

Following up some other previous comments, I'm obliged to rate this add-on very poorly due to the wrong design philosophy.
When syncing with a remote calendar the application loads all the events (1000, with no option to set less), but if TB is restarted the whole syncing process restarts.
This design choice is maybe not an issue when you have 2/3 calendars with a total of few hundreds events, but when your company is using google calendar events and you have dozens of colleagues all having 1000 events to share, it all becomes completely unusable.
On top of it, the syncing process is started without any user prompt, so TB is completely non responsive, making it worthless.

While I appreciate the overall idea behind, the implementation is so rotten that I can only wish in a major rework.

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

Before commenting on the design philosophy, maybe you should read the code to confirm that this is actually the design philosophy used. Quite unfair to leave this kind of comment based on a few observations in the UI.

On the first synchronization, the Provider for Google Calendar downloads all events from the remote calendar, in batches of 1000 (hence the number you are seeing). It is not clear how many events are in the calendar at this stage. Once this batch is through, the next one is started, which also displays as xxx of 1000. Admittedly, I could display this differently by not always showing xxx of 1000 but jumping to 1001 of 2000. There is an advanced option to change the batch size, but this is not necessary.

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.

That said, what is happening in your 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.

Rated 5 out of 5 stars

This module works perfectly for me. When it doesn't, (nothing appearing in both Agenda and tasks from Google) there is a trick to do :
Close thunderbird
Go to your profile folder (usually it's there : C:\Users\YourUserFolder\AppData\Roaming\Thunderbird\Profiles\YourThunderbirdProfile.default).
In that profile folder, open the folder named "calendar-data", delete everything in it (cache.sqlite something and deleted.sqlite) except the "backup" folder.
Close the open folders.
Restart Thunderbird and everything should be working fine.

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

Rated 5 out of 5 stars

Of course, Google changes it's rules wihtout further notifications, so, it can happen once every 2 years, few buggs appears. But what...? I've been using this app for the last 3 years and it works great, I don't even think about that. All you have to do is to READ TH MANUAL and do your little home work...

I rve read many negative reports, due to inappropriate behaviour of users...

Thank you to creator!

Greg

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

Rated 5 out of 5 stars

Keeps my schedules synced and easier for me to modify ever changing events from desk. Thank you!

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

Rated 1 out of 5 stars

Must have installed this at some point in the past, started getting this annoying message every time I tried to start thunderbird that provider needed me to login to get data. Didn't even know what that meant but finally gave in and logged in. I have several calendars with thousands of events, and it is not bright enough to only sync future events, so now I'm sitting here unable to do anything in my email until it decides to sync everything. Tried to uninstall it and restarted thunderbird, that failed as when I started thunderbird again it started syncing right where it left off.

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

The full synchronization only happens once, afterwards all synchronizations will be incremental and therefore very quick. This is how it is meant to be, the Google Calendar API allows synchronizing changes made using a token that defines when the last change was made. There is no simple way to just retrieve changed events after a certain time point without eventually having to re-synchronize all events if you scroll to the past.

Rated 3 out of 5 stars

It takes quite a long time to go from one month to the next, during which time Thunderbird will not respond. Yes, it is fetching info from the Internet, but this fetch is much slower than most Web interactions, perhaps because it is doing it on a field-by-field basis.

Ideally, the code would be fixed by somehow working faster. If that is not possible:

1) Create a local cache larger than one month. For me, that would be one month in the past and 11 months past the current month into the future. But since peoples' needs are different, have it be configurarable.

2) Do it in the background so I can do something else in Tbird while I am waiting for the data to come.

3) The Cache would ideally allow me to view and edit my calendar offline, to be sync'ed later.

I will gladly contribute if performance is improved.

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

Rated 5 out of 5 stars

this is awesome, because many times i'm charing my phone and don't access to my app. this allow me to add to google without opening calendar and have reminders to my desktop

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

Rated 4 out of 5 stars

Can't change calendars name if receive invitation to accept event. There is no option to change name so it remains as 'Home calendar' and that type of events do not sync with Google.

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

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.

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

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

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

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

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..

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

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.

https://apidata.googleusercontent.com/caldav/v2/your-email-address/events

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

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.

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

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?

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

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.

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

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