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Rookie move. I deleted a calendar (not realizing that by deleting the calendar, which I didn't use, I was deleting all of my tasks).

Is there a way to restore the calendar?

Hello, I have a problem.

Before an emergency move, I transferred my calendar data from my Windows 11 PC to my laptop (Windows 10). The calendars worked perfectly there; entries were added, etc. Since yesterday, after eight months, I've access to my Windows 11 PC again and am trying to transfer the calendar. It's not working.

Two of my calendar files imported, but my large company calendar file (3200kB) won't.

I now know it's too large, so I tried manually splitting it (using Notepad). Part 1 (500kB) imports, but Part 2 (488kB) doesn't. I also tried using Google Calendar, same problem. However, this calendar file works perfectly on the laptop.

What can I do? It contains data for eight months plus future dates.

Best Michael

I never had this problem and only been experiencing it recently.

After turning my computer off, turning back on and loading up Thunerbird, my calendars are not displaying again. I have to keep removing and readding again.

I am using Google Calendar that is linked to my phone and pc. The phone is fine and always displayings my appointments. I am using the "Provider for Google Calendar" extension on Thunderbird.

I at first though it could be OneDrive interfering with the data, but that does not make much sense as its a calendar hosted on Google, but still I configured and checked the OneDrive.

I am at a loss and getting fed up of having to readd my calendars back every day. So, I don't know if this was an update that did it, a broken extension, etc. But, I am desperate for a solution.

Regards

I don't know what to do when February 29 is in my calendar, 2026 is not a leap year. I've found nothing to help me. I have the latest version if Thunderbird. Thanks

Operating system: ubuntu 24.04. Thunderbird version 148 snap. Since the latest update, whenever a reminder appears onscreen it is squashed up into a square instead of a letter-slit oblong and is difficult to get rid of. Klicking on the close button has no effect and while klicking on X temporarily removes it, it comes back in a matter of minutes.What is happening and how can I stop this?

Updated to 148.0 this morning and now none of my google calendars are population the calendar. I am clueless as to why. Tried deleting them and re-adding them in - Not working. If this can't be fixed I am done with Thunderbird. Kind of sick of everything breaking with updates with no warnings.

Not sure how it happened but I've suddenly lost access to my Google calendar. On the bar on the left side of my calendar display screen there is a list of two calendars, Home and my email address, which I think is a Google calendar. Even though I check "Show all calendars" it does not show my email address calendar. And if I click on only to show my email address calendar it shows nothing at all. On my Pixel cell phone I can still see both the Home calendar and the Google calendar, so I guessing Thunderbird has just lost the link, although it shows a googleapi address when I click on properties. When I accept a Zoom calendar listing it has always and still shows up on the Home calendar. This seems most mysterious. Anyone have an idea of what I should do? Is there anyway I can rebuild the link to the Google calendar?

Hi, am not finding anything helpful in the support area, so hoping someone can help me solve. When a calendar reminder pops up, and I try to snooze or dismiss, I get this message:

Status Code: 2,147,500,037, null

Server Replied with 400 If you’re seeing this message after snoozing or dismissing a reminder and this is for a calendar you do not want to add or edit events for, you can mark this calendar as read-only to avoid such experience in future. To do so, get to the calendar properties by right-clicking on this calendar in the list in the calendar or task view.

Thing is, I do want to add and edit events, so I have no other options and the reminder keeps popping up every couple of minutes it seems. Any help resolving is appreciated. Thx!

Hi,

since MS has updated Win11 lately, my Outlook became a disaster. Therefore, I installed Thunderbird to become my new app for e-mails, calendar etc.. Unfortunately I can't find a way to import my Outlook tasks to Thunderbird. Is there a brief information or could someone give me any support in this matter? That would be very kind.

Thank you in advance.

Best regards ka

I'd like to receive Thunderbird's calendar alerts once and only once; if I'm not at my computer I don't want to keep hearing them over and over every 10 (?) minutes until manually dismissed. I haven't been able to find any setting (including in about:config) that turns on/off the repeat or sets the timeout between repeat alerts. Is it hardcoded? Or is there somewhere it can be changed? Thanks!

Using TB 147.0.2 on Windows 11. Installation went very smoothly, including importing all my IMAP, Gmail, and iCloud accounts. Kudos!

However, my iCloud account has four calendars (personal, shared, travel, work) and TB only sees two of the four. I can't pinpoint any reason why. There's nothing special about the two it sees or the two it doesn't, as far as I can tell.

Any hints? Suggestions? Ridicule?

I have been having a problem with calendar reminders popping up and not being able to "snooze" them.....I can select minutes/days/weeks etc but I am not able to click the check mark....all I can do is close the window so the reminder comes back in minutes.

This was an issue for a while and then one day it was magically working.....for a month or three ---then today it stopped working again. I am assuming due to an update.

Side note -- I wish we could choose to NOT update EVERY PIECE OF SOFTWARE -- if its working leave it alone....but I digress.

Any help on this issue would be appreciated.

Computer PC-A died. Had access to data

Recovered PC-A:CalA: ... users .... roaming ... <profilename> calfiles

Installed TBird on another machine (PC-B) Copied the three sqlite files from backup to same location on that other machine. Deleted WAL file. Restarted. CalA does not appear' on PC-B.

is the <ProfileName> in the sqlite files?

What to do?

Hej. Har bytt dator och installerat Thunderbird på nytt. Hur får jag med mig innehållet i min Kalender? Har hittar Exportera kalender men inte hur jag sedan Importerar innehållet på nya datorn.

Hello. I have changed computers and reinstalled Thunderbird. How do I get the contents of my Calendar? I can find Export Calendar but not how to then Import the contents on the new computer.

My google calander is synced with Mozilla Calander, but today I fiddled with Google calander and a couple of the calanders have disapeared off the Mozilla Calander, they are still on the Google Calander. I have checked in the calander settings in Mozilla and all the calanders are ticked. Is there a limit to how many can sync? Or other issue. I'm on Windows 11 Home. Thanks

Hi! I got a new computer and installed Thunderbird on it in such a way that the Thunderbird data was saved from my old computer and uploaded to my new computer (Thunderbird profile backup.zip). But unfortunately it did not transfer either the address books or the calendar and tasks entries. I tried the calendar and tasks export/import function, but when I select the import .ics file, it says that it is not found in the importable element file. I also use Google Calendar and I was able to import the .ics file from there into Thunderbird without any problems. What could be the problem?

Hello,

I have two calendars in Thunderbird connected to my email server at the provider https://all-inkl.com/. The connection is done via CalDAV.

My problem is that the calendars do not synchronize with the changes on the server or do it in intervals that are not understandable to me. I have also connected the server via CalDAV to my calendar app on my phone and that works fine. Changes to events on my phone are synchronized to the server quickly and I can check the server to see them. However in Thunderbird, the changes do not arrive and even if I manually tell the calendars to synchronize, nothing happens. The only reliable way I have managed to make them update is closing Thunderbird and reopening it. Then the synchronization happens by itself within a minute.

Does anyone know how to address this problem?

Switching offline support on or off makes no difference, as far as I can tell by testing.

My system: Thunderbird 147.0.2 (64-bit) on Windows 11 Calendar settings: - refresh calendar: every 5 minutes - read only: off - show reminders: on - offline support: on

Thanks!

After I snooze or dismiss a calendar popup (usually from my Google calendar that I have integrated into Thunderbird) the same popup window stays up, but completely blank.

Other times, a blank calendar popup just appears. I think that may be what ought to be the snoozed popups after the snooze period.

How to fix? Thanks.

P.S. I asked ChatGPT this and it gave me some suggestions which either didn't fix it or sounded too scary to try.