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Hello and THANK YOU for Thunderbird and I am looking so forward to getting off Outlook! I am about 4/5 way through setting it up on my desktop.

I currently keep my calendar on Outlook. I have been able to import my folders, contacts and mail, but when I go to import the Calendar, the box on import cannot be selected. Is there something else that I need to do to bring over my calendar? Did I miss step when I did the initial set up?

Please Someone help ?

I have followed all the suggestions I can find, but my Thunderbird Calendar will not sync with the Outlook Calendar on Windows 11. I am using TB Sync, but every time I try to add my Outlook Calendar ? It refuses to accept my Password, even though it is correct, and the User name and email are too ! It shows as error code 401, and cannot authenticate ?

I have tried a suggestion to create an 'App Password' to use in my Microsoft account, but the options described do not exist in my account !

Can anyone please help ?

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??

I have a Google Calendar, in which I manage My Tasks. I can't see my existing tasks in Thunderbird, and I can't add new tasks to the Google Calendar. New Task in Thunderbird is greyed out and the field next to it has the writing: "Please select a calendar that supports tasks".

I have seen that many had the same issue and understood that it is linked to how My Tasks in Google Calendar itself works. Is there really no workaround whatsoever?

If not, how can I manage tasks and share them with someone else (who uses Google Calendar or Apple Calendar, but does not use Thunderbird)?

Thanks in advance for your replies!

For years I have used the extension 'Calendar Tweaks' because it colorizes the entire event in the calendar. This extension is no longer compatible with versions of Thunderbird after 74 so I have stop updation after Version 69. However in resolving problems with authorization I needed to update to the current Version of Thunderbird so my events in the calendar now just show the category color at the edge of the box instead of the entire box. Is there a way in Thunderbird to colorize the entire event box or another extension that does this.

I'm just starting to use Calendar in the latest version of TB. I see that you can add little category color bars to each event. I tried to add a new category, but it disappeared from the dropdown menu as soon as I added it and a color bar never appeared in the event on the calendar display. How can I add and subtract categories? Can I change the colors assigned to categories?

Like the subject says 'updated from 115 to 128.1.1esr and now (icloud) calendars wont sync'

I understand tb doesnt need tbsync anymore, do i remove these? When i try and enable the calendar function, a 'authentication required' windows opens up with username and password. But fails when the correct information is entered. I read where you can go to google, which i did, and get the required information, but that fails also.

How can I sync the new 128.1.1esr with my icloud calendars?

Thanks!

TbSync which was used to synchronize Exchange calendars with Thunderbird calendar is no longer supported by v142. How do I synchronize my Exchange calendar with Thunderbird now?

I was browsing this page: https://support.mozilla.org/en-US/kb/adding-a-holiday-calendar

Which says:

• Select "On the Network", and click "Next".
• From the Format list, select iCalendar (ICS).

But when I select "On the Network" I see no options for file format (TB 138).

Is subscribing to remote ics files still supported, or must we download the files locally and subscribe to them there?

Hello, I want to change first day of the week to Monday (who on earth would have Sunday as the fist work day??) Problem: All instructions online are useless since there is no "Options" / no "Preferences" / in Settings there is no "Calendar" or anything referring to Calendar. Under Settings there is only General, Composition, Privacy & Security, Chat and Export for Mobile. Nothing for Calendar. Also in Calendar view ... nothing to change days order. All online articles seem to be outdated (2021 and older)and don't apply anymore. Someone advised the reboot Thunderbird ... ? How to do that? Just close it down at the X?

Please help.

Thanks

I'm using the latest version (145) and I've setup my office 365 email account. I'm trying to setup my calendar account as well but when I enter location, username and password it says that my credentials were not accepted.

I assume this means that TB is using legacy un/pw authentication which is no longer supported instead of OATH2. There is, however, no option to select OATH2 in the calendar setup process (like there is for email).

Are office 365 calendars supported by TB 145?

Hello community!

I use Thunderbird desktop for two emails: personal outlook.com (ms365 or whatever ma calls it) and school exchange account.

Exchange works fine using owl and is able to sync calendar correctly. For personal email, it appears I can only connect via imap instead of MS’s protocol, which limits its ability to sync calendar. I’m wondering if there’s a way to login personal ms email similar to exchange to sync calendar etc.?

Thx in advance for ur help :-)

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!

I believe I have noticed a change in the operation of Calendar Event notifications, following recent updates to Thunderbird, in the past week or more. I am currently on release 137.0.2 (64-bit) running on a Linux Desktop. This computer gets shut down every night, and rebooted the following morning. When a calendar reminder has been snoozed, and the snooze time expires when the computer is not running, and Thunderbird is not running, those calendar reminders used to show up the next time Thunderbird was started after the computer was rebooted, even if the calendar event time had already passed. In the last week or so, following recent updates, I believe this is no longer happening.

Also, I believe that calendar events that have reminders set, that have not been snoozed, whose reminder time happens when the computer is shut down, are also not being shown reminders the next time the computer is started, if the reminder time happened when Thunderbird was not running. This is also a change from the way it used to work. For example, if an event is marked as starting at 10:00 AM, with a reminder set for 2 hours before (which would be 8 AM), and the computer is booted and Thunderbird is started at 8:30 AM, that reminder no longer happens. That is a change from the way it used to work. A few weeks ago, in that scenario, the reminder would have been shown the next time Thunderbird started up.

My Thunderbird profile is on a separate drive.

I had to reformat my computer. No problem with managing profile and all emails and folders, etc are ok. However, my calendar is blank!

Is the calendar not stored in your profile? Have I really lost all my dates and appointments?

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,

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

I have calendars and tasks enabled in Roundcube on an account on a cPanel VPS, and I can create a calendar synced to the CalDAV calendar there, but I can’t sync tasks. When I select the calendar on the Calendar tab in TB, at the bottom of the task pane it says “Please select a calendar that supports tasks. I can create both events and tasks in Roundcube. When I create a calendar in TB there is no point at which I can chose whether to sync events or tasks or both. I’m running 143 on Win11. Please help.