Thunderbird Community Forum

Hi everyone.

Hoping someone may be able to help. I see that other users are able to fully highlight the events in calendar. I seem to be only able to highlight 2/3's (see image)

Thanks in advance

Yesterday sometime I accidentally deleted my calendar program and it's a killer I need it bad and if I can't get it I need a simple easy to use replacement it's not asking me a hundred questions just because I want to keep somebody's phone number but what I really want to do is try and find the program a little more before I give up where do deleted products go?

Trying to enable calandar on thunderbird. No information how to do it

Trying to sync date and time with windiws 11 date and time. Instructions state "three lines/ preferences" Thet word "preferences: does not appear at all

I use Thunderbird as main email client on PC, I also access via iPAD email

On iPAD if I get a Calendar invite (eg Teams) I can scroll to bottom of the invite, and there is an option to add ICS file to Calendar. I click on it and it pushes the invite to Google Calendar, and it inserts the correct appointment.

However on my main device (W11 PC) Thunderbird does not show any ICS file. There is a banner that say "This message contains event information. Enable a Calendar to Handle it" Can it be configured to use Google Calendar as the linked Calendar ? If so, could someone explain to me how to do this.

Hi,

When I switch from the Calendar tab to any other tab (Inbox, Address Book, Tasks, etc.) and then return to Calendar, the calendar always jumps back to 12:00 AM in the daily and weekly views. Previously, it would remember the correct time range I was viewing.

For example, if I’m looking at 8:00 AM–6:00 PM time period in the calendar and switch to another tab, returning to Calendar resets the view to start at 12:00 AM. I then have to scroll down every time to get back to my usual working hours.

Please restore the previous behavior where the calendar maintains its last scrolled/viewed time range.

Thanks!

I am using Thunderportable 139.0.2 with addon: Advanced Composer Expression Search - NG QuickFolders ThreadVis XNote++.

After accepting an meeting invitation, I switched to calendar tab but it keeps jumping as showed in the attachment.

Any advice on this?

Thanks, Baron

Hi

I work in NZ (NZST) which is two hours ahead of Australia (AEST). When I receive appointments from Australia, the time should update to NZST if the appropriate info is in the ICS file. However what is actually happenning is that Thunderbird is simply storing the appointment without converting the time zone, so a 2pm AEST appt becomes 2pm NZST not 4pm.

I have checked the appointments contain the appropriate information - see attached screenshot from Thunderbird for an example, showing the appointment details for an appt sent a few days ago. However when I accept this, the appt appears in my Calendar at 2pm.

I have checked and reset the local time zone as Pacific/Auckland and tried setting in manually and restarting and tried converting back to automatic and restarting. I have searched the help base on Mozilla. This suggests that Calendar SHOULD convert time zones so I am unsure why this not happening. I have even asked Chat GPT for help, with no success :-)

I am an avid Thunderbird supporter and have been a donor for many years. My Australian work is becoming more and more important and this problem is now reaching a point where it is affecting my work. I would really value any advice as to how to fix this as I will have to switch to using a Google Calendar if I can't get this to work somehow.

Best wishes Roland

Recently reminders from my google calendar keep on popping up. Suspect they popup when thunderbird checks for new mail. Snooze and dismiss give rise to an eror message

Bonjour, Depuis l'installation de la dernière version 139.0, je n'ai plus accès à mon agenda microsoft exchange. Le module complémentaire TBSync n'est plus pris en charge. Merci de m'indique comment procéder pour avoir à nouveau accès en lecture et écriture de cet agenda.

I'm trying to connect Thunderbird to my Mailcow server SOGo Calendar, but it does not work. It's not a typical problem, because SOGo generates for me two CalDAV links to connect this: 1. Link for signed in users (with RW access). 2. Public access link (with RO access). I want to manage my own calendar, so I need first case. Then I go to "Creating new calendar" window in thunderbird, enter public access link just to check, and calendar is connected! But it's not all. Then I go back and paste link number 1, also providing credentials info (I have tried a lot of variants, also "test@example.com:password", "test@example.com" and so on) and after pressing "Next" button I get a typical connect error like "Could not find your server, please check entered info".

I have done a lot of tests and checks, and this is a strange details, that I caught and I think it is a Thunderbird bug (I might be not right)... On my nginx reverse proxy I see such log when Thunderbird is trying to connect by my link with RW access: "my-ip-address - - [04/Jun/2025:23:39:51 +0300] "mail.example.com" "PROPFIND /SOGo/dav/test@example.com/Calendar/personal/ HTTP/1.1" 404 146 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Thunderbird/139.0.1" "-"". As you can see, my server returned 404 error.

You can think, that problem is on my side and my server is wrong, but please check next nginx log: "my-ip-address - test@example.com [04/Jun/2025:23:38:43 +0300] "mail.example.com" "PROPFIND /SOGo/dav/test@example.com/Calendar/personal/ HTTP/1.1" 207 125 "-" "curl/7.88.1" "-"". It is succeeded, but this is after my manual curl command like "curl -v -X PROPFIND "https://mail.example.com/SOGo/dav/test@example.com/Calendar/personal/"". You can compare two strings from nginx log that I provided and you will see the only difference is second dash in first log instead string "test@example.com" in second log. That piece of log string contains nginx variable $remote_user, and that means that Thunderbird while trying to connect my server calendar do not provide auth credentials and send request without any user that I enter to corresponding field before connect attempt.

P.S. You can ask me why do I test connection just by PROPFIND request type, because Thunderbird tries some different ways to connect too. And I will ask that: 1) Only one succeeded request, by what Thunderbird connects to my public calendar is with type PROPFIND (as I can see in nginx reverse proxy logs); 2) Other attempting ways to connect falls with same error and also do not contain any user, as I explained before.

Please give me feedback about way how I can fix that and thank you very much for your support!

I have downloaded my ICS file. I come to Thunderbird and it appears to import. And, in fact, some stuff seems to have imported. But then it stops at about 10% and gives me a message I've gone to the tools, developer tools, error console and I HAVE NO IDEA what it means or what I can do next ...

see attached.

I really don't need most of this stuff, so I just want to import most of it.

right now it appears a partial import has happened. but the error stopped it from continuing.

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.

When I create a calendar event, it will not show up in the calendar view (Month), even after trying several times. What I found is, it will only show up on the calendar if I uncheck the Notify Attendees box at the bottom, which is by default always checked. After I uncheck the Notify attendees box on an event, that event, and each successive event will then show up on the calendar, regardless if I have the Notify attendees box checked or unchecked. I looked to see if I can uncheck this box in Settings, but do not see where this can be done.

Is there a way to have the Notify attendees box unchecked by default when I create a new calendar event?

When I try to import an .ics calendar event by dragging and dropping it onto the events pane then nothing happens. When I double click on the .ics file to import it, then I get the message: "There are no importable items in this file.", but there is an appointment in the file.

In the error console ( Tools > Developer tools > Error console (<CTRL>+<SHIFT>+J) ) I see the following error appearing: "Calendar: ParserError: invalid line (no token ";" or ":") "</body></html>"'ParserError: invalid line (no token ";" or ":") "</body></html>"' when calling method: [calIICSService::parseICS] when parsing"

The parser fails on the following line in the .ics file containing the event: X-ALT-DESC;FMTTYPE=text/html:

Klick on this link to view webinar.

Who knows what is syntactically wrong with that line? Is there an on-line parser where I can check the correctness of the .ics file for Thunderbird?

The problem appears in the following version: TB version: 115.13.0 (64-bit) Platform version: Ubuntu 22.04.4 LTS, Linux 5.15.0-119-generic #129-Ubuntu SMP Fri Aug 2 19:25:20 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux VCALENDAR version in .ics: VERSION:2.0

Hello Team,

Hope you are doing well. I just installed Thunderbird email client and have imported my Yahoo Mail account into thunderbird. Further, add-ons TbSync and Provider for Exchange ActiveSync have been installed too.

However, I cannot add yahoo calendar. I have tried creating New Calendar and proceeded up to the steps - "On the Network ; paste yahoo calendar URL etc and the bottleneck seems to be yahoo credentials are not accepted. Please help.

Also is there a way to combine my hotmail, yahoo and gmail calendars into "one" Thunderbird calendar? I am not sure if calendar events from the 3 email providers are comprehensively included in my view today. Appreciate your guidance on this too!

Many Thanks, Amlesh

I FOUND no close TOPIC.

Google calendar allows color-coding of events - but the display is highly inadequate. T-bird 128 calendar apparently HAS no option to color events. But events are FAR easier to see WHEN color-highlighted. Would this be a difficult option??