Thunderbird Community Forum

I recently transferred to a new Win 11 system. I copied the profiles over and all my address book and settings are working. I have found that my calendars are not. I have three sub-calendars attached to my Home calendar, one was downloaded "USHolidays" and is working, the other two I created and are grayed out. The hover message says they are "momentarily not available." How do I fix this so they appear?

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!

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'm long time user of Thunderbird Calendar. For most of the events in calendar I have reminders that should pop up for example 7 days before the event. This was working correctly.

About half year ago. The reminders stopped working. I don't get the reminder 7 days before, but they pop up on the day of the event. This is quite unpleasant. For example If I have my car technical check deadline and I get the reminder on the deadline, not 7 days ahead.

I have not changed any settings around the time it started happening.

So far I have checked: -Individual event reminder settings : yes they still got the reminder set up to pop up some days before the event -Settings / Calendar / Reminders / Show the reminder dialog - checked -Settings / Calendar / Notification / Show notifications for upcoming events - I added here "1 day before event starts" notification, but that also doesn't work. -Tried Googling the issue. Found some threads about reminders not popping at all. Not the case here. I don't get notifications before the event, but they pop up at the time of the event. No luck here.

Since about half a year has passed since this started, I guess it's not a bug that happens to everyone.

I accidently unsubscribed my current calendar. It does not list anymore, I do not know how to list unsubscribed calendars. How to re-subscribe it? (Window 11 w/latest Thunderbird). thanks very much.

Help. Help. I have been a very happy Thunderbird user for many years. I have linked my microsoft exchange calendar to thunderbird with the TBSync and Provider for Exchange ActiveSync.

With the upgrade to version 148, those add-ons no longer work.

So I downgraded to 140 ESR and those two add-ons were ok.

But when I tried to link them to my calendar, they would not sync. I received 401 and 403 errors from the automated setups. And the manual setup, asked for my password over and over again. They all worked beautifully before.

Please how can I get them to work again. I do not want to have to shift to outlook.

thank-you

Hi,

I configured my account using the server's IMAP service. Every time I open Thunderbird, it asks me for the password of the calendar service of that IMAP service. But it doesn't have a calendar service. Even if it has, I don't want to use it.

I looked everywhere in the settings page, but could not find a way to disable it.

Why the app keeps asking me for the calendar service's password and how to disable it?

Thanks.

I have the Thunderbird desktop installed on windows 10 computers that are blocked from any internet browsing. I am not able to find instructions on how to share calendars between computers.

I am able to export and import calendars between computers, but the events only show up in the side bar as tasks. We want to be able to edit the shared calendar from any computer.

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

For the last two days, every time I start Thunderbird, a pop-up requests me to log in into Google Calendar. I have followed what little advice I can find:

• Unsubscribed/deleted all calendars
• Deleted all Gmail Accounts
• Deleted all saved passwords, and re-entered them only for my current email accounts.

How do I get rid of this irritating and unnecessary pop-up? I have updated to v128.14 but the problem persists.

Thanks in advance.

John

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?

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.

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