Lightning is gone for several times! Betygsatt 1 utav 5 stjärnor

Warum um alles in der Welt verschwindet mein Lightning-Terminkalender jetzt schon zum zweiten oder dritten Mal nach einem Update von Thunderbird? Auch Termine in Mails (via Outlook) werden nicht mehr angezeigt. Ich will zwar nicht, aber ich werde wohl wieder auf Outlook umsteigen müssen.

Denna användare har en tidigare recension för detta tillägg.

Lightning is gone Betygsatt 3 utav 5 stjärnor

After upgrading Thunderbird from 38.2.0 to 38.3.0 lightning has disappeared.
it also not in the disabled add.on
It is gone although it should be integrated since Thunderbird 38.
Is it no more included into Thunderbird 38.3.0 ?

Some users are experiencing these issues, we haven't quite figured out why this is happening. Please download Lightning or later directly from again and install it into Thunderbird, then it will fix itself.

Not working on 38.2.0 Betygsatt 1 utav 5 stjärnor

Cant make it work on TB 38.2.0!!!

Have tried several versions of Lightning (as per compatibility tables) but the only result is:
1) very slow startup, approx 30'' to 1 min
2) TB hangs frequently unreponsive, particularly after standby/suspend.
Tried everything, either to downgrade/upgrade TB to other versions, or to reinstall or remove/_recreate calendar links and/or calendar subscription, but the result is the same.
To me this could only be addressed with a better design project.
Hope this will finally work because that's the only reason to let me rethink my decision of moving to Outlook, or any other stable solution.

Use 4.3b2 for SeaMonkey 2.38 Betygsatt 4 utav 5 stjärnor

Works fine for me so far, get it from (all the way down on this page).

Lightning releases are based on Thunderbird's 38.x schedule whereas SeaMonkey follows the general releases, hence a different (beta) version is needed for 6 out of 7 cycles. Would be nice if AMO eventually accommodates that.

No longer works with latest SeaMonkey release Betygsatt 4 utav 5 stjärnor

I am a long-time user of Sunbird, so adoption of Lightning was a natural. I especially love the calendar file import feature that allows me to import calendar events downloaded from my children's school web site.

Alas, Lightning does not work in the latest release of Sunbird 2.38. Even the usual trick of editing the install.rdf file within Lightning's .xpi file to increase the SeaMonkey maxVersion parameter failed to work. I had to roll back to SeaMonkey 2.35 to restore Lightning. Looking forward to an update to Lightning soon that works with latest SeaMonkey release.

Actually, this problem highlights the primary reason I still use Sunbird even though it has been discontinued: it is a stand-alone app independent of any parent framework like Thunderbird or SeaMonkey but has almost all of the same features as Lightning.

Great Job Betygsatt 5 utav 5 stjärnor

It´s an great add-on.

Kalendereinstellung Betygsatt 2 utav 5 stjärnor

Ist es möglich den Montag als Wochenbeginn zu legen , nach der Aktualisierung ist es ja nun der Sonntag?

Anscheinend handelt es sich um einen bug, dass nach der aktualisierung der Wochenbeginn auf Sonntag gesetzt wird. Umstellen lässt sich der Wochenbeginn in den Thunderbird-Einstellungen. Für Support-Anfragen bitte nicht die Reviews verwenden, sondern das Kommentarfeld auf der verlinkten Support-Seite.

problems with security Betygsatt 1 utav 5 stjärnor

i can not use Lightning because some sites are not accessable because Lightning. Disable Lightning and all sites are accessable. Activate Lightning and some sites back not accessable. I think it is problem with security settings of Lightning.

An unfortunate combination, TB 38.2.0 and Lightning 4.0.2 Betygsatt 4 utav 5 stjärnor

Starting with the 4.x versions of Lightning, the extension messes up the settings I made. Whenever a server for a particular calendar is not reachable, it switches visibility off, readonly on, and lastly, switches the calendar OFF. This means I have to open calendar properties, switch calendar on, switch readonly off, save my settings, and tick the calendar visible. For each and every calendar many times a day, even if I only temporarily switch network connections.

I remember such behaviour back in 2011 when the "offline support" feature was not existing or in its early (experimental) stage. But now, as the offline support proved maturity, I cannot understand what rendered the offline support practically unusable.

It may be that the root cause is in TB 38 itself. I believe when I first saw this behaviour, I ignored it, thinking it would be temporary and soon be gone away. That's why I can only say: it started around the time when TB updated to 38, and Lightning updated to 4.x.

At the same time this behaviour started, TB started exposing a sluggish behaviour: from time to time (once per minute), TB suddenly starts using 100% of one cpu and becomes unresponsive for approx. 15 secs. I have then tried to switch off extensions until the behaviour went away. The critical extension was ThunderBirthday, and after some experimenting I found that the behaviour appeared only while one of my address books (LDAP) was not reachable network-wise.

As long as these problems aren't solved, I would not advise anyone to risk updating Thunderbird or Lightning to their latest versions. Previous versions worked nearly flawlessly for years, I could not imagine to live without these tools. I promise coming back and changing the rating when TB and Lightning find their way back to a stable productivity toolset.

Edit1: Prompt response, and with the fix ( the calendars remain enabled while the server is not reachable... Rating with four stars now, not for this version, but the overall completeness of this complex product.

Edit2: Spoke too soon regarding the spontaneus freezes. After the update of Lightning, they're there again, even without LDAP address books and ThunderBirthday.

Denna recension är för en tidigare version av tillägget (4.0.2). 

The caldav switching off issue is known and will be fixed with which is already in review.

The cpu issue has been known for a while, and can also occur without Lightning. See for details. The detail with the LDAP addressbook could be a good data point. Maybe you could add it to the bug?

Lightning 4.0.2: Duplicates, Hangs, Server Changes Betygsatt 1 utav 5 stjärnor

I'm hoping that I'm using the wrong version of Lightning and that all my issues are solely compatibility errors. Otherwise, Lightning 4.0.2 is a disaster. It's difficult to post that comment because I'm very attached to its many good features, but the bad features far outweigh them. To those using only local calendars, this version may be acceptable.

I will modify this review if it turns out that I have the wrong version of Lightning installed.

I'm using Lightning 4.0.2 with Thunderbird 38.2.0 under Ubuntu 14.04. is my email and calendar provider.

Every time I reboot Lightning, Lightning forgets which calendars I had enabled. Once I select the Kolab (CalDav) calendar, I get many messages stating that changes have been made on the server. I'm asked if I'd like to override those. I'm never sure what the correct response to that question is because no changes have been made on the server since I last used Lightning.

Several years of calendar appointments now have up to 11 instances of a single appointment. For example, one such appointment occurs only once a year. Now I have 11 instances of it on that day. This has happened on hundreds of appointments.

This is a nightmare and will take me weeks or months to correct. I attempted to clean up this scheduling mess, but Lightning would hang or was so slow that I could only get 5 duplicate appointments deleted before moving on to another project. I would not recommend using the above combination of software/add-ons/services until this massive issue is resolved.

I've maintained an on-line calendar via client for 20 years without ever having experienced such an issue. I'm giving 1 star because Thunderbird has been a lifesaver to me in years past. I used to donate to the developer, but having my calendar in its current status is disabling professionally and personally.

EDIT: I updated to (Linux). Not only did the update not resolve the CalDAV shutting-off issue, it rendered the CalDAV calendars unusable. The CalDAV accounts are still added, but their appointments just don't show up. Thunderbird is still booting extremely slow with this add-on attached.

Denna recension är för en tidigare version av tillägget (4.0.2). 

Good calendar, but occasionally troublesome Betygsatt 4 utav 5 stjärnor

Thunderb: 38, Lightning 4.02. --- I'm sad to say that recent troubles, including several hours of trying to work them out, have left me so frustrated with this addon that I've decided to uninstall it. I'm using Google Calendar, and the synchronisation has typically worked (mostly) well, but for unknown reasons it broke over the last few days, leaving me unable to alter anything whatsoever in the calendar within Thunderbird. Trying to start over by unsubscribing all calendar categories left me no better, as I couldn't re-add the calendar again as per the usual method - the line with adding (mygoogleemailadress) was gone. Apparently the 'cal still thinks my calendar is added to the program, yet it is invisible, and no preference panes or menu choices seem to allow me to wipe it out completely.

(In case this is an issue with the "google provider for Lightning" I apologize, though if I understand it correctly the developers are one and the same? In that case please work on a solution to display all calendars that are in store via Lightning, choices to reset them or wipe them out completely, and such.)

Apart from the Googlecal issues, the addone works well for local non-networked calendars and akaik, iCals.

*** Edit: The problem now seems to be with certain computers/Thunderbird installs only. Others work fine. I'll update this if there are any developments.

Edit 2: The problems have gone away after an uninstall+reinstall of both Lightning and the provider for Google Calendar plugin. I'm raising my review because of this, but will note that there has been a show-stopepr bug during use. ***

Denna recension är för en tidigare version av tillägget (4.0.2). 

Good but upgrades usually end up breaking functionality Betygsatt 3 utav 5 stjärnor

Thunderbird - 38.2.0
Lightning 4.0.2
Provider for Google Cal 1.0.4

Invite emails are not being sent to invited attendees.

Denna recension är för en tidigare version av tillägget (4.0.2). 

Wiederkehrende Termine verschieben Betygsatt 3 utav 5 stjärnor

Wenn ich einen Termin verschieben möchte, der sich jede Woche wiederholt, dann verschiebt sich nur der aktuelle termin und nicht alle darauf folgenden. Es müsste sich aber ein Menu öffnen, wo gefragt wird ob nur der aktuelle oder auch alle zukünftigen Termine verschoben werden sollen. So ist der kalender für meine Praxis kaum zu gebrauchen. - Bitte nachbessern, dann könnte ich ein Fan werden... :-)

Denna recension är för en tidigare version av tillägget (4.0.2). 

Würden wir das machen, würde es Beschwerden geben, dass man nicht einfach einen Termin verschieben kann ohne dass man jedes mal gefragt wird :-) Man kann immernoch die gesamte Reihe verschieben in dem man den Termin mit doppelklick öffnet, dann wird man gefragt. Wir hatten uns damals entschieden nicht bei jedem Verschiebevorgang nachzufragen, da man in der Regel ja einmal seine Meetingzeiten festlegt und dann nur einzelne Termine verschiebt falls das nächste Meeting mal eine Stunde früher ist.

Betygsatt 3 utav 5 stjärnor

Although the complement is great, upgrades do not work well with upgrades to new versions of Thunderbird. Let me try to explain myself.
I upgraded automatically to Thunderbird 38.2.0 but Lightning complement is not yet ready for this Thunderbird version, reason why I can not use my calendar
I will suggest to add a warning message to not upgrade to the new version of Thunderbird unless the Lightning version is compatible.
I have learned the lesson and will try not to upgrade Thunderbird unless Lightning is compatible.
Said that, may I ask when will be Lightning version compatible with Thunderbird 38.2.0?
Many thanks in advance.

Denna recension är för en tidigare version av tillägget (4.0.2). 

Can you contact support on this issue? Since Thunderbird 38, Lightning is now shipped with Thunderbird and therefore a compatible version should always be available (and installed with Thunderbird).

Partage des agendas & des tâches indissociables Betygsatt 2 utav 5 stjärnor

Le module est pas mal fait mais dommage que les tâches et les agendas soient indissociables. Au travail, j'ai accès aux agendas de plusieurs collaborateurs, mais du coup, toutes leurs tâches sont synchronisées également, je reçois les relances etc... Très polluant. Et aucun moyen de configurer cela.

Denna recension är för en tidigare version av tillägget (4.0.2). 

Betygsatt 4 utav 5 stjärnor

Lightning add-on causes Thunderbird to hang with "Not Responding" message for about 5 mins on startup. After that it works fine. This started occurring after upgrading to TB 38.2.0. TB starts up fine if I disable Lightning. Please fix.

Denna recension är för en tidigare version av tillägget (4.0.2). 

Bug with attendees since Lightning 4.0.2 Betygsatt 5 utav 5 stjärnor

Since Lightning 4.0.2 i can't invite attendees with Provider for Google Calendar 1.0.4.
Event is ok but only on selected calendar, no attendee.
Thank you.

Denna recension är för en tidigare version av tillägget (4.0.2). 

This is a known issue, we will fix this either for or 4.0.3, whichever comes first.

Betygsatt 5 utav 5 stjärnor

Works fine and beautifully!

(I had to use a Lighting 3.3.3 though, because thunderbird in ubuntu 14.04 is not the version with the highest version number for some reason - which the developer was so kind to point out.)

Denna recension är för en tidigare version av tillägget (  Denna användare har en tidigare recension för detta tillägg.

Please note that the latest version of Thunderbird is not 31.x, but instead 38.x. Please see for details and get older versions of Lightning at

Great add-on only TB 38 starts very slowly because of this Add-on Betygsatt 4 utav 5 stjärnor

Lightning is very great add-on. But there is one big problem. TB 38 starts up very slowly.with Lightning on. It takes 10 to 15 seconds more to start TB 38 then when the Add-on is off. I hope you can fix this problem very soon. Or maybe there is a solution. I am using Windows 7 64 bit.

Denna recension är för en tidigare version av tillägget ( 

Unpossible work with Betygsatt 1 utav 5 stjärnor

My PC is going crazy when I switch Lightning on, ventilator is running full speed (i7, 8GB RAM, SSD). When I switch this Add-on off, it works again properly. I've observed such efect last months, before I was a satisfied user.

Denna recension är för en tidigare version av tillägget ( 

Are you also using the Provider for Google Calendar? If so, please unsubscribe from the "Birthdays" calendar until I release the next version of that addon.