If you share your computer with other users, and another user's account is still logged in with Thunderbird running, this error can occur. Make sure you're the only user logged in to the computer when updating Thunderbird. The easiest way to do this is to restart your computer.
Once the computer starts up again, start Thunderbird, click the Help menu, and select Check for Updates End any Thunderbird processes that may still be active, either manually or by restarting your computer. If a Thunderbird update resulted in Lightning calendar not working, you might find your issue and a recommendation how to deal with it listed below.
Seamonkey users may use these instructions, but details might be slightly different. Some linux distributions like Redhat and Fedora package bundle Lightning with Thunderbird, and users should be able to use the instructions below.
But Linux users of other distributions who installed Lightning by using the distro's package manager may need Linux package instructions. Background: Since version 38 the Lightning calendar extension is bundled with Thunderbird, meaning the Lightning extension comes with Thunderbird and you do not need to download the extension. For versions prior to Thunderbird 38 you will want to download the extension from Calendar versions. This may happen if the update of the add-on is stuck.
Don't worry about your calendar data, it is left untouched and will be available again if you follow these steps to restore Lightning:.
After Thunderbird has been relaunched, Lightning will be back and you will have access to your calendar data. When I click on each, this is the information I get. You own calendar data is actually stored in yet another folder, so if you are subsequently able to successfully reinstall Lightning, your own calendars should all just automagically reappear. Okay - when I search on "lightning" now, nothing comes up.
But Thunderbird still won't open. The spinning circle lasts a little longer now as if it's working harder, but still nothing. I really appreciate your help. If you or anyone else have any further thoughts, I'll be back tomorrow! After working on this for 13 hours today, I need a drink! OMG - I'm in! A combination of Windows Safe mode and Thunderbird safe mode did the trick. Thanks again for your help!
Search Support Search. Home Support Forums Thunderbird Thunderbird won't open after Learn More. Chosen solution If using Windows' Safe Mode is part of the solution then it suggests that something outside Thunderbird is part of the problem, possibly your anti virus or other security software.
Search Support Search. Home Thunderbird Updating Thunderbird. Note: If you run Linux such as Ubuntu and use your Linux distribution's packaged version of Thunderbird, you will need to wait for an updated package to be released to its package repository.
See Installing Thunderbird on Linux This article only applies if you installed Thunderbird manually without using your distribution's package manager.
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