Thunderbird Community Forum

I'm experiencing an issue with Thunderbird when trying to open attached PDF files. As soon as I double-click a PDF attachment, Thunderbird immediately shuts down completely. When I reopen Thunderbird and try again, the same thing happens.

I have already restarted my computer, but the issue persists. The only way I was able to open the PDF files was by accessing the email directly through Outlook.

I am running Thunderbird on a new Windows 11 laptop. When I download new messages and try and open them my laptop locks up. Anyone else have this problem? Thanks Dave

I'm running TB on Windows 11 on a Dell Desktop machine. It's a pretty basic installation with EE Cyber security, which is I think Norton. I've been using TB for a couple of years but recently it has almost stopped working. I notice from Task Manager that TB is massively leaking memory and consuming much CPU time. I don't think I have any add-ons and I only use TB for email. It's now so bad that I'm even unable to go into TB's Settings or Tools or anything else. I've tried creating an exclusion for TB profiles and TB.exe in the Norton. I've tried starting TB in troubleshoot mode but all to no avail. I have it in IMAP, Port 993, SSL/TLS for incoming mail and Port 465, SSL/TLS, Authentication Required for Outgoing mail. I'm currently often unable to even access mail previously downloaded to the local Mail folders, TB is just hanging with the bar in the lower right corner endlessly running along. Most puzzling of all, is that very occasionally is starts working again and then I dare not switch the machine off! It's become an indeterminate system. Please help, I'm nearly eighty and trying to organize my holiday, which is needs email to make bookings. Thanks in anticipation.

I have been using Thunderbird for years and am on version 152.0.1

I also regularly use the Mail Merge add-on and this has worked great. However, just come to use it and it has put 80 messages into my Outbox but I cannot get them to send!

I hit the "Send Unsent Messages" and nothing happens.

Very frustrating and would be very happy if someone can help identify the problem!

I am upgrading from my old HP computer running Windows 10 (not window 11 compatible) to a new Lenovo PC running windows 11. How can I transfer all my emails and email files to the new computer sothat I do not lose them?

Hi everyone,

I'm trying to access some old emails which I know were stored on a laptop running Ubuntu 20.04. The laptop was wiped years ago but I have restored the data from a backup in October 2023 or thereabouts.

When I try to open Thunderbird it throws up a dialogue saying 'You have launched an older version of Thunderbird' suggesting I need to re-create my accounts. I just need to access the emails from the restored data and I'm worried if I connect to the mail server that my settings might just erase the emails all over again.

What should I do?

Thanks in advance. Any help would be gratefully received.

Hello. When handling a large volume of emails, some sent messages are not saved in the Sent folder. As a result, they are only saved on the 3rd or 4th attempt, and the recipient receives 3-4 copies of the same email. What could be causing this issue and how can it be resolved? We reinstalled the client and configured it to save sent emails to a different folder, but all without success.

Hello,

I need help recovering my old emails from Thunderbird.

I am using a POP account. Recently, I changed the message storage location from the C: drive to the F: drive. After doing this, Thunderbird only shows recent emails, while my old emails are missing.

Here is what I have checked:

The mailbox files still exist on the F: drive. Inbox file: approximately 1.1 GB Sent file: approximately 1.18 GB I also have a complete Thunderbird profile backup of approximately 2.73 GB. The profile contains prefs.js, the Mail folder, and all profile files. Some account folders such as: pop.accessarchitects.in pop.accessarchitects-1.in pop.accessarchitects-2.in have Inbox files that are 0 KB. However, another mailbox file named Inbox is about 1.1 GB, which appears to contain my old messages. Thunderbird downloads and displays new emails correctly, but it does not display the old emails. I previously had around 60,000+ emails organised into many custom folders such as Contracts, Bills, Axis Bank Statements, Notifications, etc. Some mailbox files still have large sizes, but Thunderbird does not display their contents. My folder structure F:\Mails\

   Inbox (1.1 GB)
   Sent (1.18 GB)
   Inbox.sbd
   Local Folders.sbd

Inside Local Folders.sbd, I also have mailbox files such as:

Inbox (~642 MB) contract & bill (~778 MB)

The data appears to exist, but Thunderbird is not recognising or indexing it.

My Questions How can I reconnect these existing mailbox files without losing any data? Is there a way to rebuild the indexes so Thunderbird recognises the old messages? Could the issue be caused by an incorrect profile mapping after changing the storage location?

I have not deleted the original mailbox files, and I have a complete profile backup available.

Any help would be greatly appreciated.

Thank you.

I added two new email accounts to my Thunderbird installation (140.12.1esr (64-bit) under Windows 10), and am able to receive and send mail just fine. But the T-bird Search utility doesn't work for those accounts. I can do a Search for an email address, subject, etc. that's showing on my screen for those accounts, but the Search utility comes up empty. Search does work for three other accounts, however. Any ideas?

Hello

I use Thunderbird for many years, I have a profile weighing 3,6 GB now… I already moved this profile on my old computer, from default location to a data disk. Now I needed to move it to a new computer, so I moved it to my Dropbox (with local storage on both), to conveniently access it from the new machine, and to have some kind of backup (with a real backup, more occasional, of course). I don't plan to launch Thunderbird from both computers, so there should be no conflict.

I installed a fresh new download of Thunderbird (152), which I just upgraded to 153. The new computer runs Windows 11 Professional (build 26200.8875), has 32 GB of memory and a large amount of free disk space.

My profile.ini file currently looks like: ``` [Install734AE0B000379192] Default=C:\Dropbox\Applications\Thunderbird\0q9jw2nn.default Locked=1

[Profile1] Name=default IsRelative=1 Path=Profiles/ncc2rvps.default

[Profile0] Name=default-release IsRelative=0 Path=Profiles/30jrlwud.default-release

[General] StartWithLastProfile=0 Version=2

[Profile2] Name=PhiLho IsRelative=0 Path=C:\Dropbox\Applications\Thunderbird\0q9jw2nn.default Default=1 ``` Profile 0 and 1 were created at installation time. I added the Profile2 and I set StartWithLastProfile to 0 to ensure the profile manager sees the profile.

When I start Thunderbird, after choosing the PhiLho profile, I end up with an empty window: no accounts, no messages, no folders, etc. I see no relevant error in the developer console, or the logs. What I am missing?

Dear Foristi, after updating to V. 135 Oesr (64Bit), neither AOL mail nor Yahoo mail cooperate any longer. Passwords checked, correct. Other PC, not updated, still connects to AOL and Yahoo addresses without flaw. OS: Linux Mint, both PC have 8 GB RAM. Where did I screw up?

Thanxalot in advance -rick

I use vertical view. Hate threading so that's turned off. I use a medium to large message pane. Recently been having issues with column visibility. Not sure if this is new or whether it's that I've come to a Linux client from a Windows one and there's a setting I missed when I set up the client.

Essentially dragging the column divider doesn't work properly (for me). The columns always seem to auto adjust width. Similarly if I resize the message pane the columns don't remain fixed they auto adjust.

I don't find this helpful. I prefer to set up the columns to display the amount I want/need in subject and From and I truncate the date to simply not display time.

How do I set column widths to remain where I put them? Or is this function now lost.

I cannot set up my yahoo mail account in thunderbird. first, yahoo does not let me log in using firefox (all extensions off). I set chrome to my default browser. chrome at least allows me to log into my yahoo account directly. First part of set up is okay: server setings, imap etc. then thunderbird wants to connect to yahoo.com. Using chrome I can log in. It then tries to open some file and returns an error message, "no app found." I attach some screen shots.

I am using Ubuntu 24.04LTS with all current updates. xdg-com is installed. the version is 1.1.3. Thunderbird version is current: 153.0 (64-bit).

What is the problem?

I recently changed hosting and now I am getting login boxes nonstop to my old servers. I see no way to remove them and this is so annoying I may have to change from thunderbird. All my emails are there, it just keeps checking for old servers.

Thanks in advance!

Scrappy Doo

happens on Windows 11 also

Every birthday or holiday reminder (I haven't entered these) generates an error when i select snooze or snooze all. The reminders I have entered snooze fine. Using gmail calendar.

On Saturday morning 27 June 2026 I tried to login my Orcon email account via Thunderbird (which I have been using for a long time). But my login didn't work, I got a message saying "login to POP3.orcon.net.nz with username habitation failed." On 30th June 2026 I reported the problem to Orcon.

Orcon gave me the following settings for Thunderbird. I have done that and even made a new account: Incoming Server Type: IMAP Mail Server: imap.orcon.net.nz Port: 143 SSL: Off Authentication: On (username and password required)

Outgoing SMTP Server: Mail Server: smtp.orcon.net.nz Port: 25 SSL: Off Authentication: Off

Since then I have spent many hours and going around in circles with Orcon's Technical Support to resolve this, but no luck. They blame Thunderbird. I used Thunderbird Troubleshoot Mode. The message that comes up reads: login to server mail orcon.net.nz with username habitation failed. Please can you check that your server settings above are correct? And if there is a bug? Irma