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In event creation in Calendar the options for repeat pattern are daily, weekly, bi-weekly, monthly or yearly. There is an option to create a custom pattern, but if I enter every 28 days, because I want the event to recur every four weeks, it is over-ridden by the option above which is the repeat pattern, daily, weekly etc and the event appears daily. There appears to be no way to create an event that occurs repeatedly every four weeks (28days)?

Can anyone help please?

I'm on Thunderbird 151.0.1 (64-bit).

NB: I have been using app specific passwords for all steps with this.

I previously had nine icloud calendars - my own and those shared with me - synced into Thunderbird. Not all had events in them. Then all the events stopped syncing.

I unsubscribed all the calendars and tried to re-add them with the calendar specific URLs. Initially none of them would re-add.

Got a new app specific password.

Followed online tutorials to try using general login to https://icloud.com and https://webcal.icloud.com. Calendars detected, but would not add into Thunderbird.

Then back to calendar specific URLs, and the calendars are adding, but none of the events.

I've tried adding the calendar feeds to Outlook, which works, so I'm pretty positive it's a Thunderbird problem rather than an Apple problem. If it can't be resolved, I'll have to move onto Outlook, but it's a bad time to do that as I want to resolve some Thunderbird email chain dependent projects first.

Any help very gratefully received.

I have a calendar that is shared by 4 devices. If I snooze or dismiss a reminder on 1 device, it should not affect the reminder on the other devices. Please implement a local snooze option at the individual calendar level.

When I extend or modify calendar events there are no reminders given. Often, I will extend an event as I get more appointments. Or modify these events to change the day or hour. These events will never give reminders. Can I reset the reminders for these events? Jerry

I have 4 gmail accounts in Thunderbird. The calendar shows items from all 4 accounts. My issue comes when setting up an invitation. Pretend my accounts are:

personal1@gmail.com personal2@gmail.com personal3@gmail.com business1@gmail.com

If I want to set up a meeting with invitations from business1@gmail.com, I select the account from the left side of the calendar list, then I create a new event on the day I want. The dialogue box correctly shows "business1@gmail.com in the Calendar drop down box at the top. I can then fill in title, location, category, time etc. But when I click on Invite Attendees, thunderbird has already added "personal1@gmail.com" as the first attendee and is waiting for me to enter the contact of the second attendee. If I add people and send it out, it goes from my "personal1" account and not my "business1" account and any replies come into "persoanl1". Same thing happens if I start by selecting the "personal2" or "personal3" accounts first in Calendar view. It always sets "personal1" as the organizer.

I can not figure out why Thunderbird is automatically using "personal1" as a default and sending from there. I am adding a screen shot to show what it looks like after adding an invitee.

Tip for improving the calendar function of Thunderbird. It is said that the travel time that I enter in my iPhone, for an appointment is also saved in iCloud. Unfortunately, I cannot see or create this in the Thunderbird calendar. It would be nice if this were possible in a future version of Thunderbird.

Tips for improving the calendar function of Thunderbird I use Thunderbird 151.0.1 (64-bits) on Windows 11.

1) In a weekly overview, I do NOT see a date for each day. I would

  really like that. Then I wouldn't have to count and calculate.
 The best place would be just next to the day so e.g. "saturday 12-5"
  p.s. keep in mind that according to the country there are different form
 in Europe 12-5 means the 12th of may, i understood in America it is different.
  or 12 + the first 3 letters of the month would also be fine "zaterdag 12 mei"

2) It is said that the travel time that I enter in my iPhone,

  for an appointment is also saved in iCloud.
  Unfortunately, I cannot see or create this in the Thunderbird 
  calendar.
  It would be nice if this were possible in a future version of 
  Thunderbird.

Hi there,

I'm having an issue where I receive invitations by the owner of a calendar i subscribed to. I have to subscribe to the calendar to be able to schedule events with them.

When I receive the invite, it keeps saying "already processed" which is not the case. I dont have that event in my calendar and it has not been accepted.

I have checked that the subscribed calendar is not linked to my account (calendar settings, email account: empty) and the actual calendar is linked to my email account (calendar settings, my email account).

what should happen logically is the "subscribed" calendar should not be counted as my calendar, events should not be counted as already processed and invites should be clickable and then be transfered to the calendar linked to the receiving email address.

Mind you, thunderbird on mobile works like it should. Its only the linux client that has this issue.

Thanks in advance for any help.

Just moved to a new computer and am having trouble importing my previuos TBird calendar. From my prior computer backup (created with Macrium Reflect) I have tried moving the local.sqlite backup file to the calendar-data folder in my new TBird profile. However none of my prior calendar events have loaded into my new calendar. Is there another process or file/files I should be using? Thanks in advance. Rob W.

We have bought a new computer from our tech guy before. This time, all was fine except for the Thunderbid calendar. The 20 GB of email files are all there and email still works. Only the calendar is blank. Our guy admits he dislikes Mozilla and rarely deals with it. Is there any way we can find the contents of the calendar? The old computer is still here in our house, but we only have one monitor. I had birthdays, lots of birthdays setup as repeating events. I hate to lose that.

This is odd as we didn't lose anything the last time we bought a new computer from same guy. We already were running Windows 11, so that is not the issue.

When I go to set a custom time for when an event's reminder will happen, it doesn't matter what date or time I put, when I click OK, it sets the date to be today, and the time to the next hour, if I use the date and time picker dropdown thing (clicking the arrow instead of typing it in), the date does set correctly, but the time is impossible to set even like that

Video

If you turn on "Show Timezones" in the New Event window, then close it, and open a New Event window again, the time zones will be shown, but the option will not be checked in the settings, checking it now will hide it instead

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

I have been using Mozilla Thunderbird for many years on Windows desktop (now Win 11 ver 24H2 for x64 based systems).

In the last week or two Thunderbird has been giving me unwanted reminders for future events on my Google Calendar. (They are Thunderbird reminders, since they disappear when closing Thunderbird). If I try to dismiss them I get an Error Code: Modification failed. Status Code: 2,147,500,037, null Server Replied with 400

Dr google suggestions to get rid of them only apply to iOS or Android, nothing mentions windows. The problem does not occur on my iPhone.

If I just close the reminder windows they reappear in a few minutes.

I uninstalled and reloaded to be sure I had the latest Thunderbird.

Hello,

I'm trying to create a calendar event with irregular recurrence. Not only is the starting time different, but also the duration. Since AFAIK this is not possible using the interface, I directly edited the .ics to this:

RDATE;VALUE=PERIOD:20260506T063000Z/20260506T130000Z,20260507T054500Z/20260507T110000Z

I then manually synced the calendar. The starting time is honored, the duration, however, is not. I found the entry in the .ics changed by Thunderbird to this:

RDATE:20260506T063000Z RDATE:20260507T054500Z

How can I get Thunderbird to honor the different durations?

Thanks

I have a shared family calendar and a private google account calendar that is separate. I tried importing some events from the family calendar to the private calendar. I created a .ics file, and started using the calendar import function in Thunderbird on my Ubuntu laptop. I found the file, selected it, and filtered for current and future events. I then clicked the confirm import button, and the screen changed to a view progress screen. This screen correctly shows the target account, the source file, the import type, and the number of events, so I think it's correctly set up. The progress bar shows "Importing... 0%", and there it appears to stall, consistently after several attempts. I saw another thread that talked about read-only calendars, but I don't see a setting, either at the Thunderbird level or at the calendar level that might be restrictive in that sense. Is there a preparatory step or a setting I'm overlooking?

I have my calendar from mailbox.org synchronized with my thunderbird via CardDav/CalDav. I have multiple calendars in the same account (e.g. work, free time, brithdays, ...). I cannot change in which calendar an event is saved after I created it.

How to reproduce: Edit an allready existing event and change its calendar (e.g. from "free time" to my "work" calendar).

Expected behaviour: The edited event is now moved to the other calendar.

Observed behaviour: The event is not moved (any other changes to the event are saved though).

It is not the fault of my provider as it works on my phone and on their web app.

This is either a bug in any of two ways:

• It does not change calendars events but it should.
• You are not supposed to be able to change the calendar afterwards and that means the selection of the calendars should be grayed out/ give you no option to save it.

(I know I can Ctrl+X and Ctrl+V it into a diffferent calendar, which I use at moment but that costs additional time.)

Thanks for any help with this :)

PS: I have to choose a topic but the calendar is not even part of that list. What is going on there?