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Hello, so I have Thunderbird installed on 2 Windows 11 PC's both are updated and operating with all updates! On my 1st (main) PC which I use 98% of the time Thunderbird has been running perfectly with IMAP and Oath2.

Last night on the 2nd PC I rarely use I opened Thunderbird and it started to download messages for awhile and all my 2026 up until OCT 2025 disappeared?

I logged into Yahoo Mail from a browser and yup all gone?

I sent a deleted by accident request to YAHOO and today all my mail had returned when I checked on my 1st (main) PC.

I started the 2nd PC and all was good, till it started downloaded messages again? And POOF right back to square one?

What's happening? Should I confirm that IMAP and OATH2 are enabled on that PC before I do something else? I've sent another DELETED request to Yahoo and at this point I'm thinking to just REMOVE Thunderbird all together on the 2nd PC.

hello, i cannot seem to find a solution online, hopefully someone here can help.

i often receive emails with images attached, and most of the time people don't resize the image. so you can imagine over time this all adds up. i dont always need to keep a 6mb image versions. i would love if there is a way to resize the email image attachment, to at least still have a smaller copy for refence, but not end up with a huge email account (local/pop3)

preferably a one click solution, or even a routine i can run on the file system, etc.

thanks

Using Acronis True Image for Western Digital (ver 2025 build 41936) to backup my files on a daily basis. Recently the backup program has been stopping and reporting that it cannot access some Thunderbird files, even when Thunderbird was not running (1st image) I tried 'Compacting all Folders' in Thunderbird but the result was the same (2nd image). Lastly, I tried clearing the cache - the result is the same. In all cases Thunderbird was not running during the backup.

i realize that this is not a Thunderbird issue, but I've been unable to get help elsewhere. I wondered if anyone might have a solution since Acronis apparently sees the file as being accessed - is there a way to remove that?

For some time now my primary email address gets wiped clean every night and is empty every morning. I have to transfer received mail to another input address to keep it safe!

I deleted my Thunderbird account and created a new one on the same computer. I used a Profile saved on my external hard drive. The address book info was replicated. The hierarchy of folders and their emails were not replicated in the left hand pane. Is there a way to retrieve those folders with their content? Please, I am not super techno-savvy, so take me step by step. Thank you.

I've been trying to move my Thunderbird data (148.0) from a Win10 to a Win11 machine. I've meticulously followed both the methods outlined at http://mzl.la/1ApHiU3. I have copied my original profiles.ini from the ...AppData\Roaming folder to that location on the new machine, then corrected the drive locations in the file (see attached profiles.ini image). (yes, the correct "j4sqsccb.XXXXXXX" folder is copied to the new installation's root: a bulky several-GB)

In order to try to replicate my original computer's admittedly-awkward installation from long ago, I have added the suffix " -p -no-remote" to the desktop icon's Target field. And on startup, the new T-bird does properly show my original profiles in the Select panel - even though I only ever used the one that functioned correctly, identified as 1 in the profiles.ini file (see Choose User Profile image, IDs X'ed-out).

However, on selecting that profile on the Win11 machine, Thunderbird just takes me to the account setup screen, as if it's unable to locate or load the account settings for that profile.

I'm only doing this clunky method of copying-over out of ignorance; I'd be very happy to simplify the mess I'd created decades ago with my original installation. OR if you think I'm better off wiping all evidence of past installations to start from a clean install, I'll be happy to do that. Please let me know if you need additional info I've failed to provide here!

Also adding images of my ...Roaming\Thunderbird\Profiles folder and Installs.ini file, just in case!

After downloading and running installer (Thunderbird setup 148.0) from Thunderbird website, Thunderbird opened as usual, showing my three email accounts. The 2 accounts I use for almost everything are both Yahoo accounts (yahoo.co.uk and rocketmail.com). But.. neither of these accounts will work without a yahoo sign-in pop which is pre-filled with an account name (example graphic attachment : thunderbird01red.jpg). 1 example shown but the same thing happens for both yahoo accounts.

The 'Next' button, which I assume will ask for password, does nothing.

I have attempted login via webmail. I enter account name, am asked for password and Yahoo insists on sending me a verification code - to the other yahoo account (the yahoo.co.uk account), which I cannot access! I then attempt to login to the other account to access my pass code and the same thing happens in reverse, telling me that a verification code will be sent to the first account.

Via Thunderbird, which has for years done all this automatically behind the scenes, I can get absolutely nowhere. Via webmail, I am in an 'impossibility loop'. I have cleared cache for each account.

Why won't Thunderbird allow automatic account login, as has been the case since the year dot. These are the 2 accounts around which my entire life is ordered - can somebody please help.

I have some more email accounts with Hotmail and Outlook but there is popping an error just after the popup where it asks for permissions to connect Thunderbird to my account, and I say Yes and also receive the email that some new apps have connected to my accounts, but Thunderbird just at that step instead of Finish it displays that error message like asking again for Username and Password and even if I fill there the correct details it doesn't go further. Something is unclear at that step, because I also tried removing the passkey from the respective account Page at outlook.com and also the 2FA but the same.

Can you help me?

Thanks

I am shifting over to TB from Windows Live Mail. I have installed TB Ver 115.16.2 on 7 computers successfully (Win 7, 10 and 11) over the past year. But on one Win 7 computer TB will not save the password. Usually TB asks for the Password during set-up. But here it asked for it in a pop-up box. Yes, I entered the correct password. Yes, I said "save with Password manager." But here it keeps asking for it, over and over. At one point TB connected to the POP download server, just long enough to download all the incoming emails, but then quit connecting. It won't connect to the SMTP server. The port numbers for POP and SMTP are correct and the security settings are correct. I've done a lot of web searching. Most sites say that profile files logins.json and key4.db may be corrupted. I disabled them (by renaming) and copied those two files from another computer on which the same Thunderbird version works properly on the same mail server. Same thing - TB still keeps asking for the POP server password. I just deleted TB (uninstalled, and deleted all the appdata directories, and verified there were no lingering registry keys using a list shown on Spiceworks). I'll next reinstall, but don't have much confidence that it will work. Thanks.

Mam problem, pierwsze parę kont dodanych do Thunderbird działa poprawnie i nie ma z nimi problemu. Natomiast pojawił się problem z kolejymi pocztami -nie widzę na nich połowy folderów, albo w sumie żadnych, ani wiadomości wysłanych, ani roboczych. Znowu na innej poczcie w odebranych, nie widzę nadawców - tylko własnego maila. Próbowałam na nowo zainstalować te poczty, jednak nie przynosi to zamierzonych efektów, albo wręcz jest jeszcze gorzej.

I've tried setting up Thunderbird archiving according to the documentation to save archived messages locally, and in the same hierarchy they had when I archived them. That is, if I have:

INBOX

   Box1
   Box2

... etc. then archiving would create a parallel structure in Local Folders

However, this isn't working.

I select "Keep message archives in Other (Archives on Local Folders).

For "Archive Options" I select "A single folder", "Keep existing folder structure of archived messages" and "Recreate inbox folder".

However, when I archive something, Thunderbird just creates a folder "2026" (this year) and puts the message in there.

Why are my settings NOT working?

- Tim

no matter what i enter in settings, any time i minimize thunderbird in win 11 to tray, and then click on its tray icon to reopen it, it opens at this odd sizing every time. i always put it fullscreen again, and minimize, then go to open it again, and there it is, at the odd size again. no other program does this in my two machines. just thunderbird, and i have never set this size and placement, it just seems 'forced' every time, making me have to resize it every time i open it from tray.

J'ai déjà un mail gmx , "andre.et@gmx.fr" est-ce cette adresse qui est crypter ?

Ou est ce une nouvelle adresse ? Chez Mozilla

Merci de m'éclairer André

I have Version 140.8.0esr | Released February 24, 2026, for Linux Mint (up to date)

I have a CardDAV address book on a Nextcloud instance that i want to sync to Thunderbird.

When i open Address Book and the clikc on " Create a new address book" the Account Hub modal window opens. None of the 4 options (including Add Remote Address Book" do anything, i.e. I can click as much as I like but nothing happens.

I have a few folders I need deleting.

They do not appear in my webmail (mailserver) but do in Thunderbird - I have tried so many methods on your forums, but nothing is working - can you help?

Hi all — I’m running into a persistent threading issue in Thunderbird (v.148) vthat survives profile rebuilds and affects only specific conversations.

Symptoms Some threads show the expand/collapse carrot normally.

Other threads (same accounts, same folders, same time period) do not show the carrot.

The pattern is consistent: the same conversations fail before and after a full profile rebuild.

Both Inbox and Sent show a mix of threaded and unthreaded conversations.

No global setting seems to be wrong, because most threads work correctly.

What I’ve already checked mail.strict_threading = false

mail.thread_without_re = true

View → Sort By → Threaded

View → Threads → All

Folder Repair on Inbox and Sent

Full profile rebuild

Re‑added all accounts

Rebuilt .msf files

Verified that threading works across folders (Inbox ↔ Sent)

Verified that threading works across accounts

Verified that threading works for most conversations

Header checks For the conversations that do thread, headers look normal.

For the conversations that don’t thread, the headers also appear normal:

Message-ID: present

In-Reply-To: present

References: present

No obvious corruption, malformed IDs, or missing brackets.

What I’m trying to understand Why would Thunderbird:

Successfully thread most conversations

Fail to thread specific conversations

Preserve the same failures before and after a rebuild

Show carrots in Inbox but not in Sent for the same conversation

Show no global misconfiguration

Is there a known edge case where Thunderbird rejects a thread even when the headers appear correct?

Are there hidden rules about ambiguous References: chains, multi‑server storage, or cross‑account BCC workflows that could cause this?

Any insight into how Thunderbird decides not to show a carrot would be appreciated.

Thanks in advance.