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My old PC crashed but I still have the old TB profile. When I copy that to the new PC the mail is restored but the calendar is blank. How can I import the old events?

In the last two weeks I have been collecting reminders that can't be dismissed and today I got a new one that is for next Sunday.

They are all birthday reminders, some from contacts, and some from entries straight into the calendar in Thunderbird. All of them are in the calendar in Google tied to my email address and when I check their details, it says they are created by an "Unknown Organizer."

I've tried to delete them in Thunderbird and in Google Contacts via the web -- they won't go away.

Thoughts? I've been using this for years and this is a new problem.

I am on Windows 10, everything is updated to the latest including Thunderbird.

Using Thunderbird 128.5.0esr (64-bit) on 128.5.0esr (64-bit). In calendar view, I see all my appointments with the background colour of the calendar they are in (see attached). In my inbox view, I have the Events tab open at the right. All day events have the background colour of the appropriate calendar, but ones with timings have a dot. (see attached). How do I make ALL calendar events have the background colour of the associated calendar in the mail events tab??

In Thunderbird 128.8.1esr (32-bit) Danish language version, on Windows 10, when a list of past notifications pops up, I cannot close them. Whether I use "Turn off" individual notifications one by one, or "Turn all off", nothing happens, except the first time I try, I can see at the bottom left of the screen that communication takes place with the server. But the notification doesn't disappear. On following attempts, nothing happens at all, until I restart Thunderbird, then again I get a long list of notifications from the past that have never been turned off.

As for individual notifications popping up at the scheduled time, I can mostly, but not always, turn them off.

The calendars are no google servers. The problem started occurring 2-3 months ago.

What to do?

I am using Thunderbird 138.0.2 (64-bit). I recently purchased a new Windows 11 computer. I installed Thunderbird on the new computer and copied all of my profile from the old Windows 10 computer to the new computer. When I set up an event in Calendar, Thunderbird no longer gives me reminders when I set up an event. I have tried uninstalling and re-installing Thunderbird, tried using Troubleshoot Mode, and ran the Config Editor to check Calendar settings. Nothing has worked. I am still not getting reminders. I would appreciate any help with this problem. Thank you.

I have an event yesterday with a notification on Google calendar.

I start up email today. Notification pops up. I cannot dismiss the notification.

I edit the event to remove the notification. On Thunderbird - but it won't save. So I go to Google calendar and remove the notification.

On Google calendar, it says I have no notification for this event. On Thunderbird it will NOT let me remove the notification.

Now every time i open thunderbird, the notification pops up. Short of deleting the event (which I do not want to do because I want a record of it on my calendar), there is NO way to make this stop.

I have had this problem pop up periodically for the last 18 months. (Unfortunately, it's getting bad enough with no fix I will need to find a different email/calendar application).

Any ideas how to fix? (Can we get the bug fixed in the code?)

I'm trying to create an event that start from time in PST, and end in China Standard Time. However, the date time selector doesn't seems to be aware with the timezone I selected and still prompt that I selecting wrong time.

I'm on the latest stable Thunderbird release, 138

Hi,

Someone sends me a calendar appointment for 11th of May at 16:30-18:30 and another at 18:30:20:30. I accept these appointments. In my calendar, they correctly display at these times.

When I close and re-open Thunderbird, the first appointment is now scheduled for 12th of May, but the second is fine. When I close and re-open Thunderbird again, the second appointment is now scheduled for 12th of May as well.

The times are completely different too.

I'm using Thunderbird 138 from the Arch Linux repositories but I've also tried the Flatpak package to no avail. I've tried setting my Timezone manually and using my System timezone to no avail.

GNOME Calendar, which is also synced to my Caldav server, displays the appointments at the correct day and time. The web interface for my mail server also displays correctly.

It's only Thunderbird that screws it up time and time again.

This has been going on for years and it is driving me insane. I can't use my calendar with Thunderbird because I keep thinking my appointments are at the wrong time!

Send help.

I have my google calendar integrated into Thunderbird using the native integration. When I receive an email invite, I would like to click the Accept button and add the event to the google calendar not the native Thunderbird calendar "Home". I can't figure out how to do this. I've looked through all the settings and properties boxes I can find.

As a second question, is it possible to move or copy an event from the native calendar to the Google calendar? I can't figure out how to do that either.

As of yesterday, 3/18/25, I can no longer dismiss or pause and calendar notifications. The drop down works but the dismiss or pause doesn't work. All I can do is close the Window. This seemed to start after a Microsoft update/restart. Gee, who'd a thunk it? Jeff

Hello Thunderbird Team,

I have 2 Gmail accounts currently linked to my Thunderbird program, and every time I start the app and every few minutes the app is still running, ever since the 15th, it's been notifying me of my account's set birthday on both accounts (main & alt).

And every time I close the event window, click "Dismiss all", or "Snooze all", it throws a 300 MODIFICATION_ERROR popup.

So far, I have not been able to fix the error through Thunderbird's settings, so if you have the solution to this, just let me know!

Best regards, opera

P.S.: I'm not sure if this is the right place to be sharing this on, or if I have to reach out to Google Calendar support instead. If you know where I should be taking this, also let me know!

I have added my calendar to Thunderbird and it is syncing with Google but when I add a new event it only allows me to set one notification time. I have a standard notification of 30 minutes before something happens and in Google I can add additional notifications like a day before or a week before. I don't see that I can do that when I create the event in Thunderbird. Need to create all of my calendar events in my Google calendar?

This is a usability feature request. If there is a better place to post this, please let me know.

Thunderbird very cleverly adjusts the time of ICS events to the local timezone. That seems like an obvious best practice. The problem is that without actually displaying the timezone, that leaves the user guessing what timezone is being referenced. This can occur when traveling, when you may or may not have adjusted your timezone settings correctly, and further confusion is possible if calendar is not set to use the system timezone setting. Simply adding the timezone to the time display would provide an easy feedback to allow the user to recognize any local misconfiguration and otherwise remove any uncertainty about what time the sender actually intended.

Hello everyone,

When I create a new event in the calendar, I click on the start day and use the drop-down mini-calendar to pick the right day. Unfortunately, this drop-down shows a misleading view – the first column shows up as Sunday. How can I fix it? Seeing Monday in the first column would be much more natural. Sunday as a first columns is very confusing and leads to miss-setting the date of an event.

Thank you Paweł

I've been using the Calendar for a long while I think I set it up when using the Lightening add-on. I used to be able to add a Custom Email reminder from the Set up Reminders dialog. The Choose a Reminder Action had the option to send an email. This option has disappeared. The only thing I have done is to add a Google Calendar so I can use it along with my phone's calendar. The events created before this issue still show the email notification on the tab.

Can anyone explain what has happened to cause this and what action I can take to get the email reminders back?

Hi, I have a strange experience with thunderbird's calendar: an hour or two after i created a new appointment in my calendar, i cannot change this appointment anymore. When i do so, this appointment is not saved anymore when i click on "save & close". When i alter and save this appointment within the hour it works normally and the item is saved as expected. I searched the settings, but nothing could be found concerning this issue. My OS: Ubuntu 24.04.2 LTS. Thank you very much for your efforts. Wyl. Holland.

I run Thunderbird 128.9.1esr (64-bit) on Linux Mint with the email and calendar service from Mailbox.org

I receive an invite from google mail user. See screenshot.

Thunderbird does not recognize that this is an invite. This is the problem