Thunderbird Community Forum

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!

When a message is removed from a folder via that folders' Retention Policy, I assume the message is permanently deleted. Is it possible for that message instead to go to Trash? Thank you.

Google calendar invite created in Thunderbird lacks Google Meet link and sender acceptance is off by default .

Given:

• A user with a personal Google account; and
• User has enabled Google Calendar setting Automatically add Google Meet video conferences to events I create; and
• The user’s Google calendar is added to Thunderbird using instructions in https://support.mozilla.org/en-US/kb/using-lightning-google-calendar; and
• The user creates an event with at least one guest in Thunderbird;
• The user has 30 min default notifications in TB enabled.

When:

• User creates a meeting invite with at least one guest and Thunderbird saves/sends the event to Google Calendar via its current integration

Then:

• No Google Meet link is attached to the event in Google Calendar; and
• Google Calendar does not record the event creator as an accepted attendee; and
• As a result the event creator does not receive reminders unless they manually accept the invitation by logging into Google account online.

Expected behavior:

• Google Meet link is automatically included in Events with at least one guest;
• The event shows in TB as accepted by the sender by default;
• The sender is reminded in TB before the meeting as per default reminder settings;

Note: As it stands, I cannot use TB for creating online meeting with guests, as it includes no links for meetings, and no reminders. It is only useful for reading google calendar but not for creating or updating meeting events.

I have been dealing with this issue for the last several thunderbird versions. I am currently running 115.18.0

Everytime I try to configure an existing gmail account for thunderbird via File -> New -> Existing email account

I specify my Name and gmail email address, then password for the gmail account.

The google authentication pop up launches " Mozilla Thunderbird wants to access you Gmail" and I click "Allow"

As soon as I click "Allow" I am asked to download a file.

Google gemini says this file is a sign that Oauth is not being accepted by thunderbird.

What I have tried. I verified Thunderbird is set to accept cookies I have verified there are no previously stored gmail passwords (as this has never worked) I have changed my default browser from Firefox to Brave and verified the same behavior

please help, Thunderbird has never been able to connect to gmail when running on this Ubtuntu install.

Starting Feb 8, 2026 my yahoo accounts no longer work in Thunderbird. I have accessed these for over a dozen years using Thunderbird. In addition, when I open Thunderbird at all I end up getting endless loops of yahoo login messages. The mechanisms in the messages do not work at all. I have received no Yahoo mail since that date. To troubleshoot the issue I tried logging into the accounts directly through Yahoo. Broken, with no access at all to any help resource from Yahoo. Although Yahoo seems to be keeping mum on the problems, there is spotty information online that Yahoo servers were breached a few days ago. One report claimed that user data for about a billion accounts was compromised. I suppose that may explain why my accounts no longer work anywhere- neither from Yahoo itself nor within Thunderbird. Is there a way to disable the incapacitating yahoo popups pending any larger solution to this?

Hello, I have two microsoft email addresses linked to Thunderbird, one @hotmail.com and one @outlook.com. I have been using Thunderbird with them both fine for some time. Recently, the outlook.com account has stopped sending emails via Thunderbird. As far as I can tell, this was out of nowhere, and I hadn't changed any settings. It still receives emails.

Both accounts use the same SMTP information, and the hotmail.com continues to work with those details.

I have tried changing the settings and even deleting and readding the account but it hasn't fixed it. I have also checked the outlook account is still IMAP and POP enabled and it is.

When I do try and send an email, I am told: "Login to server smtp.office365.com with username [edited]@outlook.com failed. with options to Retry, Enter New Password (which loads a new window briefly but then disappears) and Cancel."

When I cancel, I get this message: "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.office365.com timed out. Try again."

My server settings, on both accounts, are: smtp.office365.com Port 587 STARTTLS OAuth2 And the user name matches the email.

Does anyone know what I might be doing wrong, and how I could fix it? Thank you!

Having used Outlook for over 20 years I have over 500 folders and thousands of emails. Is there a way to tell how many folders and emails I have? Can Thunderbird handle such a large import, maintain my folders and their hierarchy, and the maintain the emails stored in them?

I use Pop3 and have about 30 email accounts. Is that an issue? Does Thunderbird import all of the account settings?

Can I run both Thunderbird and Outlook simultaneously to determine if Thunderbird has imported everything and the migration is complete and fully functioning?

I read someone had a problem importing because their Outlook was 32 bit versus 64. How do I tell if mine is one or the other?

Do you know of any other import issues/problems?

This has been happening for a long long time - probably a few years' worth of versions. I have just put up with it... currently running Tbird 147 and it just happened.

When editing an email (either the body or the Subject), if you use the backspace button (the one that deletes to the left) to delete some text sometimes the cursor will incorrectly be positioned about 5 or 6 characters further left than it should.

For example, if I had the text: "Quick brown fox jumps over the moon"

If I were to highlight "fox" in the above example, and hit backspace, I would expect the cursor to end up positioned between the remaining spaces after 'brown' ( pipe symbol here is meant to represent the cursor position): "brown | jumps"

But instead what happens is that the cursor ends up somewhere among/before the word "brown". It's always further left than it should be, by 5 or 6 characters.

I believe it only happens when highlighting multiple characters and then hitting backspace. It may be more (only?) prevalent when editing/replying to an existing email. (But I'm still only editing the new portions that I add at the top of the email; I'm almost never editing in amongst the original quoted email content.)

I also haven't ever been able to figure out how to make it happen, sorry. It is just random...It will happen once in an email, but then not again. But it happens frequently - 3-6 times a day perhaps. (Depends on how many emails I am editing.  :) )

I don't believe that I have noticed this issue if I were using the Delete button (deletes things to the right). I don't think it happens when backspacing one character at a time...but it might. I also use Option-Backspace to delete whole words at a time (instead of highlighting the word); not exactly sure if it happens only if highlighting a word, or only if Option-Backspace, or single key press... sorry, it is so random and unexpected that I don't have more specifics.

Hi!

I've added some subfolders to my inbox on my laptop but these folders dont appear or sync on my phone, I've checked all settings and they seem to be in order. Can you point me in the right direction to fix this?

Cheers,

Henk

For some time now, TB (147.0.1 (64-bit)) has been VERY slow loading, the first thing in the morning. If I close it and re-open, it opens at the normal--and desirable!--speed. Any thoughts? Regards, Dave