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Getting an error message when i get a notification of an event...ie: birthday coming up... when i click on dismiss. I get this error message:

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.

 I follow direction and make my calendar read only but it does not fix the problem.  I continue to receive the error message.
 Anyone have any ideas how to fix?

Thanks

I use Windows 10 with the task bar on the Left side with added tool bars for lots of quick links which makes the task bar wide. When I copy & paste in Calendar the paste window is under my task bar. Why do you have the paste window always placed at the 0,0 window position?? Can I change the position? I will be using Win 10 for along time. My other notebook is on Win 11 where I use StartAllBack enabling me to have the same left task bar.

I am setting up an I select "Invite Participants" the pop-up screen locks up.

I have tried to change accounts one at the time with no luck. I also selected the "Attendees" tab near the bottom of the pop-up. That did not help either.

This is running on a Windows 11 Home operating system.

Any help would be appreciated.

PS - I moved from Microsoft Outlook to Thunderbird as I did not like the new Outlook. This has been very frustrating.

WHEN I ENTER AN ITEM IN THE TB CALENDAR IT OFTEN (NOT ALWAYS) SHOWS UP ON MY I PHONE CALENDAR. HOWEVER WHEN ENTER SOMETHING ON THE I PHONE IT NEVER SHOWS UP ON TB

Hello. I regularly sign up for online conferences, then when I get the confirmation email with the details I can't transfer it to the calendar. I even tried saving the ical event separately but when I try opening it using Thunderbird I get an error message. The only way I found is to transfer the contents manually and create an event on calendar, which is time consuming. Anyone knows how to fix this? Thank you in advance

When I create an event, I choose No Reminder. When the event comes dur, I get a reminder. When I edit the event it ha a 'Custom Reminder'. I can't find where to turn this off.

I have 3 different email accounts. My calendar was associated with the main account. Now for some reason it is associated with the second account. It is also not showing on the day/date calendar area, but does show on the event area of the calendar. It is associated with the second of my accounts, not the first.

Any ideas?

Not sure where to post a feature request, but I use a scheduling app (Playtime Scheduler) that consistently offers ics files with an empty LAST-MODIFIED field. So I have to manually edit the ics file every time before it can import into my calendar.

Would it be hard to make Thunderbird ignore an empty field like that and import anyway?

I have this issue with my reminders for peoples' birthdays. I have an event on their birthday that comes from my Google contacts. That event has a reminder 1 week in advance. When the 1-week mark hits, I get an undismissable notification from Thunderbird. I can close the reminder window, but it'll show back up within a minute or two. I've tried removing and re-adding this calendar but it doesn't matter. When I look at the details for the event, I see that the Organizer field is Unknown Organizer <unknownorganizer@calendar.google.com>. My regular email address is listed as an attendee. This has been happening for at least the last several months, perhaps more than a year.

I imported a US_Holiday. ics calendar file in to Thunderbird/Lightning. How do I remove the all of the events that calendar imported? It has junked up my regular calendar with not wanted holidays and observances.

I have noticed that when a .ics file is not able to be manually imported into Thunderbird via the Events and Tasks there is a way to get it to import. Simply edit the filename of the .ics file to something very short (like less than 8 characters). I'm not sure why longer and more complex .ics filenames fail but shortening the filename almost always works.

Thunderbird Version 152.0 Manjaro KDE Plasma 6.6.5 Kernel 6.18.36-1-MANJARO (64-bit) Graphics Platform Wayland ThinkPad T420

Successfully added monthly-repeating event for the first day of each month beginning at 00:00 hour with duration 0:00. These events correctly appear in another calendar (Google). This also shows there is no confusion between 'monthly' and '4-weekly'.

In Thunderbird's Calendar display, these events do not appear in day, week- and month-view modes, when the first of the month is the first day to be displayed. When the first of the month is positioned further into that view-mode's display then that repeating-event is correctly displayed.

The above happens in Thunderbird's Safe Mode with all add-ons disabled.

Many thanks PS. I am unable to report a bug in Bugzilla due to having lost login-credentials.

I've asked this before to no response. I JUST did a new search and found a users solution that I just tried to no avail. Which was to add the Provider for Google Calendar Extension, then unsubscribe and resubscribe to my Calendars! The old W7 version of the Calendar had the ability to have a Reminder EMAILED to oneself! That option with the new W11 version has disappeared! Can someone please ask the Coders to re include this option! THANK YOU! I 'LIVE" by this option! My Iphone 3rd party Calendar thankfully still has this option! But I would LOVE to have this back on my W11 Laptop in the Thunderbird Calendar!

I have been using Thunderbird calendar synced to gmail a/c on Linux Mint for many years and have been able to send reminder notifications by email. Recently I had to unsubscribe my calendar and reinstall to clear a fault and the notification by email function has disappeared from Thunderbird event notifications. Can you tell me how to restore that function?

Version 140.11.1esr

How do I import *.ICS file in a reasonable amount of time. I have appointments in an ics file of less than 1 K in size, typically 700 - 800 bytes in size and they take HOURS to import and do not connect properly then to allow editing the appointment. This is from Baylor Scott and White, a major hospital system in Texas. If there is a problem with the imported file structure, please point me to the correct file structure. I like Thunderbird, but this part of the calendar is very frustrating. Clarence

Hello,

I'm hoping someone can help me recover a local task calendar.

Environment Thunderbird 152.0.1 (aarch64) macOS Local Thunderbird calendar (not Google, Exchange, or CalDAV) What happened

Several months ago I deleted a local calendar because I believed I was no longer using it. Unfortunately, that calendar contained all of my Thunderbird tasks.

After deleting the calendar:

the local calendar disappeared from Thunderbird all of my tasks disappeared I have not created any new local tasks since then

What I have recovered

I have an older copy of my Thunderbird profile from before the deletion.

From that profile I have:

calendar-data/local.sqlite prefs.js

I inspected the SQLite database and confirmed that it contains 394 tasks.

The task records appear intact, including task metadata such as:

titles categories completion information recurrence tables alarm/snooze tables related Thunderbird calendar metadata

All of the recovered tasks belong to the same calendar ID:

8420c0c3-6b20-436c-a39b-d4183d2665e1

Current profile

My current profile contains only my two iCloud CalDAV calendars.

The deleted local calendar no longer appears in prefs.js.

Because of that, the task database appears to be orphaned.

What I have already tried Restoring the old local.sqlite Creating a new local calendar Exporting the tasks to ICS and importing them

Thunderbird reports:

"No importable items found in the file."

My question

Since the task records still exist in the original local.sqlite, is there a supported way to:

recreate the missing local calendar definition so Thunderbird recognizes the existing tasks, or migrate the orphaned tasks into a new local calendar?

If necessary, I'm happy to provide:

the recovered local.sqlite the current prefs.js any additional profile files

My goal is simply to recover the 394 tasks into my current Thunderbird profile without losing any data.

Thank you for any guidance.