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I tried the instructions at https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer, and watched the video. Copied and pasted exactly as instructed - nothing happened. Is it possible to transfer the data, including message filters and in-box folders, to the new PC? Old PC: version 115.18.0 esr (32-bit) - on Windows 7 New PC: version 153.0.3 (64-bit) - on Windows 11 Or is this data transfer impossible due to incompatibility of the different Thunderbird versions? Thanks. I also tried transferring the data from the old PC to a slightly newer laptop on Windows 10, utilising Thunderbird version 140.13.0 esr (32-bit). Nothing happened there either. Is it a lost cause? Do I just go ahead and create new message filters on the new PC and forget about trying to transfer the data and associated rules? Maybe that's the way to go for me. Thanks.

I want to copy my windows Thunderbird profile to Linux but my Profile Directory will not open when I press open directory. I downloaded Thunderbird from the Zorin app store, and it may be a flatpak or something – it won’t tell me now because I have already installed it – but I believe that could be a reason for the directory not opening. Is there a non-PC-literate way of finding out and fixing this?

Hello Mozilla Support,

I once had a Firefox Sync account under the email [redacted] @outlook.com that I no longer can get into because of the loss of the MFA device and the recovery codes. I now use a different Firefox account under [redacted] @outlook.com. However, I did have a yearly subscription to Mozilla VPN tied to the old account that I need canceled ASAP. Are you all able to go in and cancel it for me?

Thank you, Collyn Mosquito

Hello,

I recently upgraded to a new PC from Windows 10 to Windows 11. For some reason I can not open links in any emails, even if right clicking them. I have gone through all steps here: http://kb.mozillazine.org/Standard_diagnostic_-_Thunderbird but nothing has changed. I have disabled Win Defender completely and still no change.

Any idea what I am missing? I am at a loss at this point.

Thanks for any advice or direction.

Since yesterday (27 Apr 2026) any and all mail that comes into Thunderbird gets marked as SPAM. I searched online and found people saying that I could reset the junk training filter, so I did this, but incoming mail was still marked as spam. The next suggestion was to delete the training.dat file. Did that, restarted Thunderbird and incoming messages are still marked as spam. The last suggestion was to turn off adaptive junk mail controls. Didn't want to do that because I assumed that it would let spam through. Nope. Turned it off, restarted Thunderbird and two emails from my work came in and got flagged.

I'm running version 140.10.0esr (64-bit) on Windows 11. I am using IMAP to connect to the mail server but it's not running any spam detection software (like Spamassassin). I know this because it's my server and even if it was, no updates have been preformed since the first of this month and this just started happening yesterday. Combine this with the bug that Thunderbird notifies me of incoming mail, even if it's spam (didn't post about this because there are plenty going back a couple of years), is starting to make me look for an alternative.

Title says it all, "auto resize pictures using CTRL - + does not work". Generally speaking, the size of pictures simply WILL NOT reduce in size to view its entirety. Even when the scroll-bars are used the picture is still to wide. I have searched and asked for any setting in about_config, NOTHING! I truly expected something. The ONLY STUPID WAY to view said oversize picture is Download it then view. Isn't that a HACKERS DREAM??? YES I HAVE tried looking in SETTINGS and searched for months, found nothing that actually works. So now I have to use that 4-LETTER word... HELP!

All was well until about six months ago. When I try to connect to my provider TB won't connect. BUT. At other times it will connect then every few minutes will try to connect again - then again .... I get this message "Connection to the server mail.comcast.net timed out". Then I get this message each time it fails "Login to server mail.comcast.net with username 170834000 failed". It keeps asking me to input my password even though everything is working appropriately. Then at other times it says it doesn't connect but it has connected and it still continues to ask me for a password.

I have uninstalled TB and reinstalled it thinking that would fix it - it didn't. I have changed my password - again to no avail. I let TB choose where to put things and configure each item appropriately. I don't try to get in the way of what works.

Comcast is apparently getting out of the email business and asking everyone to move over to their chosen substitute (Yahoo.mail) and I have not chosen to migrate at this point. Maybe that's the problem. This is the message I get each time I log into Comcast.net:

"A better email experience is now available for you

You're invited to upgrade your email account to Yahoo Mail, so you can enjoy a more user-friendly experience. Your email address, messages, folders, and contacts will not change.

With Yahoo Mail, you'll enjoy enhanced security, a built-in calendar that's easy to use, AI-powered inbox organization, and a top-rated mobile app for easy access on the go."

I am not aware of any changes in the settings from before when it was working well and now when it seems to be erratic.

I am not terribly computer savvy, but I'm usually able to trouble shoot and fix the issues that confront me. This time I'm out of my league! I need help.

Thank you for helping me.

Every five minutes Mozilla sends me a page asking for access to my Google account. I click "deny" and it goes away for a few minutes, but comes right back. And while it is on, I can neither send nor receive email. Is there some way to get it to go away and stay away? Thanks, Larry Wright

looking for an email i accidentally deleted from july 10. it was from walmart with a gift card from a friend. how can i access it? my deleted file only goes a couple weeks. thank you for any help. janis

I use Firefox in Windows 11, but when I close it and reopen it, my three open tabs are gone, it is supposed to open them, as checked in settings. I see the same thing happening in the MacOs, but no answers for Windows either.

I wanted to export my address book from my Windows10 PC, after a while I got an error message, something happened during the attempt. Since then I cannot start Thunderbird anymore. The program does not respond. So I can't find the Thunderbird version.

I am trying to complete an online video interview, but Firefox is not allowing the website to use my camera and microphone. I have checked the website permissions, but the camera and microphone are still not working. Please help me enable camera and microphone access in Firefox.

Android app is Missing Spam Folder. A Yahoo filter on the server moves important emails to the spam folder. The spam folder does not sync with my other folders. Yahoo places these messages inside the Thunderbird app but they cannot not be read, I cannot find the folder, I cannot sync the folder, and the app does not give any other option on the setting panel. On my phone I have to have both the Firebird and the Yahoo App to see all folders. How can I fix it_

Thank you.