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That’s not a new bug for me, I’ve been dealing with this one for a few years new, across multiple PCs and Thunderbird installations: from time to time, some of my appointments disappear from Thunderbird calendar. Forcing a synchronization achieves nothing: the appointments are correctly available on google calendar and are missing from Thunderbird.

From time to time I need to unsubscribe from the google calendar, re-subscribe and for a few days everything is fine. Then appointments start to disappear again… rinse and repeat.

Now, I understand it’s impossible to point out what’s going with so little details, and in fact my question really is: what can I do on my side to identify the root cause of this? Are there error logs I can check or other clues that can help with that?

Hi, I was running Thunderbird on windows 10 before I had to do a system reset, so all software has been wiped out from the disk. After reinstalling thunderbird I wanted to recover the previous calendars, so I copied the backed up files within the 'calendar-data' directory to the calendar-data directory in the new install and moved the new files in a directory. (see attached image) Before doing this I had already created some new calendars in the new installation.

Nevertheless, despite the files have been moved and the older ones substituted them, I keep seeing the newly created calendars but NOT the older ones (which are the ones that interest me) and I believe I should not see the newly created ones. Why is this happening? Why is Thunderbird still showing me the new calendas when the files aren't accessible anymore??? Regards

I'm trying to sync Thunderbird Calendar with iCloud. Every time I enter the password generated by iCloud, Thunderbird indicates that the credentials are incorrect. Any suggestions?

Hi,

I try to subscribe to online calendar (.ics format), for example the calendar of the school of my child: webcal://outlook.office365.com/owa/calendar/e9d7c3e1627c47dbbb494c04dd439cb6@montessoricollege.nl/90ee10a5ac224fa2af7e51cd8be5a46215938853368348660489/calendar.ics

But no matter what I try Thunderbird always returns there's no calendar in that particular location. When I try to subscribe to the same calendar in Google (online) it works fine and I can see all content.

This is just an example. This problem occurs with virtually all calendars I try to add in Thunderbird.

Has anyone a solution for this problem? Thanks

Hi,

since Thunderbird 145 installed, I can't update my Nextcloud calendars anymore. Neither new calendar entries are created, nor can I delete them, nor can I acknowledge a reminder. - The create dialog simply closes, no error message, but also no calendar entry. - The Delete button when editing a calendar entry just animates it's being pressed. Nothing else happens. - The reminders window does not close. Neither for a single reminder, nor dismissing all reminders does anything except animating the button press.

I (thought a long time about this and then) tried to unsubscribe from the calendars and tried to add them again. Not a good idea: Now TB only shows "Searching your calendars" indefinitely (for hours). This is regardless of whether I add a username for logon or tick the "no credentials needed" box - to me, that seems to indicate TB is not communication at all with Nextcloud.

This all worked fine before the TB 145 update :-(

Using Nextcloud Hub 10 (31.0.10).

Any hints?

Danke & Grüße von nobi

Hi Thunderbird team,

I recently moved over from Postbox because Thunderbird is known for being stable, powerful, and professionally maintained. I’m more than willing to financially support the project if it means the basics — like Google Calendar integration — work reliably.

I’m assuming this is just a technical issue on my system, so here are the full details.

I’m on macOS Sonoma, running Thunderbird 145.0 (aarch64), and the entire Calendar module appears to be missing.

Symptoms: • When creating a new calendar, only “On my computer” is available • No Google, no CalDAV, no ICS, no network calendar options at all • The calendar wizard never shows Google OAuth • No calendar providers appear in the UI • calendar.provider.* entries are missing in about:config • The profile does not contain an extensions/ directory (so Lightning and the GData/CalDAV providers are not being created or loaded)

What I have tried: 1. Fully removed Thunderbird.app 2. Downloaded the correct aarch64 build from the Mozilla CDN 3. Renamed the existing profile (…default-release → …default-release-old) 4. Started Thunderbird with –ProfileManager to force creation of a new profile 5. Thunderbird shows the “Profile missing” dialog but does not automatically generate a new default-release profile 6. After manually creating a new profile, the Calendar module is still missing 7. No calendar-related files are generated in the new profile either

My goal is simply to add Google Calendar using the built-in provider, but Thunderbird behaves as if Lightning and all calendar providers are missing.

Question: How can I force Thunderbird to regenerate the full Lightning/Calendar provider set inside a new profile? Or: Which specific files or modules must exist for the calendar subsystem to load?

Any help would be appreciated — at the moment Thunderbird cannot create any network calendar at all.

System diagnostics (Calendar providers missing in Thunderbird 145.0 on macOS 14.8.2)

macOS version: macOS Sonoma Version 14.8.2 Build 23J126

Thunderbird version: Thunderbird 145.0 Executable type from the “file” command: Mach-O universal binary: x86_64 + arm64 The correct universal binary is installed.

Profile configuration (from profiles.ini): Profile1: default → Profiles/2a3nceor.default (Default=1) Profile0: default-release → Profiles/gpr8c7hb.default-release Install section shows default-release is locked as the default profile

Problem summary: • Thunderbird reports “Profile missing” • Thunderbird does not auto-create a new default-release profile • Even newly created profiles do not load the calendar subsystem

Calendar-specific issue: • “New Calendar” only shows “On my computer” • No “On the network” option • No Google / CalDAV / ICS • No Google OAuth login flow • Thunderbird behaves as if Lightning is not present

Profile folder contents: The profile does not contain: extensions/ Lightning gdata-provider caldav-provider ics-provider calendar-data/ storage.sdb local.sqlite

prefs.js contains no calendar.* entries. This suggests that the entire calendar subsystem is not being initialized.

Expected behavior: • A new profile should include Lightning + providers • “On the network” → Google / CalDAV / ICS should appear • Provider modules should be created inside the profile directory

Actual behavior: • No calendar subsystem • No providers • No way to add any network calendar

Request: What could prevent Thunderbird 145.0 from generating or loading the Calendar/Lightning subsystem on macOS 14.8.2, even with a completely new profile? Which component might be failing to register?

Thunderbird 140.5.0esr (64-bit) on ubuntu unity 24.04 Desktop

Hi. I'm a long time and happy user of Thunderbird.

I have some suggestions to make it even better IMHO:

1. I would like to see some color added to the Calendar to make it visually more appealing. Right now it is grays and blacks - see attached pic. It would be nice if there were options to change the colors of the top 4 lines.

Currently you can choose a Category Color, but I would like to see the Title of the Event in that color, not just a tiny unobtrusive Bar at the end of the Title.

2. When you Click on an Event, a Screen comes up showing some information for that Event and an 'Edit' button. I don't see the point of this. Why not go directly into the Edit ? Of course for Multiple Occurrence Events, you would still first ask if the Edit is for 'Current' or 'All'.

3. I don't get the 'ESR' & 'Release' business. I have the 'ESR' version which, I believe, means I will only get updates once a year. Why ?

Seems like a hassle to convert to the 'Release' version. I don't think I will bother. Why not just have one version, and provide updates regularly as most other Software does?

I really appreciate this venue which provides the ability to post questions. Last week I got a long time problem resolved as a result.

Thanks for listening. M.....

when I exported my calendar on my old computer to an ICS file, it saved the original Disk and file path which is now different on my new computer. Some how the file path is embedded into the ICS file, why, anyway how to resolve?

I ran out of room on my C: drive a few years back, and moved user accounts to a new and larger drive G: and linked the USER directories to the G drive.

Thanks for looking

I want to just search my calendars, but the search bar only seems to look up emails, not calendar items. I know I was able to do it in the past. Attached are two images.1) of me putting the search bar into the calendar tab and 2) of the search bar showing up there - but when I search all that comes up are emails.

How does the 'Covert to Task ...' function work on an email? When I click the Convert to task, nothing happens. I was expecting to see a task in my task list. Where does it go? I have a 'Task calendar' and a Google calendar in my list.

mac calendar keeps wanting me to use a password for Safari, which I do not use, which then passes me on to Chrome. Plus calendar is not syncing with phone anymore. Help

Thunderbird Mobile (for Android) is missing support for iMIP/iTIP (calendar invitation) response emails. For context I will add that in Thunderbird Desktop when a calendar event attendee has responded to an invite the resulting email message shows a highlighted text about the status of the response. There is also a button to either update the event when the response has yet to be processed or show the details of the event when it has been already processed. This capability is missing in Thunderbird Mobile (for Android). Please add it to the feature list as it annoying to have to lay hands on a laptop just to update a calendar event. Thank you.

For the past few days when I open Thunderbird I get a message "https://caldav.one.com is requesting your username and password." (see attachment). I've never signed up for Caldav so I don't have a username or password. If I hit "Cancel" it proceeds as normal. If I enter my email address and log-in password it also proceeds as normal. In either case I have to go through the same process every time I open Thunderbird.

The month at a glance format was great. This new format(s) Feels like you fixed something that was not broken. I liked the old format. How can I get back to it?

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?

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.