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Importing CSV address books does not work properly. The resulting folder cannot be accessed by emails to be sent.

The imported Address Lists cannot be used in an email as a list. The error message is that the address is not a valid email address. However, if a new Address List is created with the contents of the imported file manually copied, then it can be used as an email address.

I also found that clicking on an individual address in the imported csv, will open the individual email address.

So the addresses are valid but the list is corrupted.

Hello,

I downloaded all my emails from my .com mailbox into Mozilla Thunderbird. I could see all of them for about three days, and I was very happy to have them stored locally, as I am planning to move my mailbox elsewhere.

However, today all folders appear empty in Thunderbird and I can no longer see the emails, even though I can see that the files are still stored on my computer.

I have been trying for hours to solve this problem with the help of AI, but without success.

Could you please help me restore or display the emails that were downloaded locally?

Thank you very much for your help.

Best regards, Michaela

Four accounts: Rogers Yahoo, Office365, GMX, and a second Yahoo account

When Thunderbird recently asked to access to my provider's server, I gave my Rogers Yahoo account and password; everything looked fine. But when I tried to use my second Yahoo email account, all the folders contained the same data as the Rogers Yahoo account, even though the email addresses were different; my original emails were gone from the Inbox and other folders.

So I began to follow the instructions in Mozilla's page "OAuth2 Authentication for Yahoo, AOL and ATT". 1) with Config Editor, changed "mailnews.oauth.usePrivateBrowser" to TRUE 2) checked for "Accept cookies from sites" in Privacy & Security settings 3) checked authentication settings: All Outgoing servers were set to "OAuth2", as well as Yahoo and Office365 incoming servers. The GMX incoming server was set at "Normal Password" with no option for "OAuth2". 4) I am in Canada and do not use VPN. 5) Finally, I deleted the second Yahoo account (tc2002ca) and all its data from Thunderbird. I logged into Yahoo! Mail online to make sure I had the correct password. I then added tc2002ca as a new account using manual configuration. I entered all the settings to match the Rogers Yahoo account, except (of course) the password which was associated with the tc2002ca account. The result: same as before - all the folders of this account were identical to the Rogers Yahoo account.

To summarize, all the settings in the two Yahoo accounts were the same (imap.mail.yahoo.com and smtp.mail.yahoo.com) except the passwords. When I "tested connection to server" in each case it came back "Successful". Please help me get back to having two Yahoo accounts in Thunderbird, as I have had for years. By the way, I have had no problem using SeaMonkey in a similar way. 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?

I made a folder and saved emails in that folder. A few days later they were all gone, empty folder. I followed suggestions on here, did the repair, erased password and replaced it, did the subscribe, and now even the folder is gone. I spent hours trying to research this and repair it and now I have nothing.

I just accidentally deleted a day of history, now it has to relearn a bunch of stuff.

Please add support for undo, so that if you do it by accident, you can reverse it.

During the week of March 7-13, 2026, upgrade(s) caused the size of my bookmarks, fonts and tabs to shrink to barely readable (see attachment) in the Firefox browser window on my Windows 11 PC. I've tried every internet base advice article. How do I increase the size of them?

https://1drv.ms/x/c/b995e0ec7736c180/IQALH00OXltRS5FH4UxpgpA5ATOjGo0hRxTtCNWLZ-opvds?e=4%3a00477a01e3044a6b9f8485f4254c206a&sharingv2=true&fromShare=true&at=9

I made a folder and called it April. One day the folder just disappeared. No one seems to help me recover the folder and i need it. Once I moved emails into that folder they are no longer available in my inbox. SO if you know how to recover my folder help, or if you know how to recover emails that were sent to a folder, that would work also. I use Windows 11 and I have the most recent release of Thunderbird. I use Charter.net as my isp which is pop. Thanks,Charles

Ich habe das Problem, dass ich in einer Anwendung in Firfox die Tasten nicht drücken konnte. Also bin ich auf reparieren gegangen. Jetzt habe ich alle meine Einstellungen verloren! Wie komme ich wieder zurück?

On my Linux machine, I exported the public key for an email address in Thunderbird 140.8.0esr (64-bit) into a file. I transferred the file to my Windows 11 machine via Warpinator.

On the Windows machine I am running Thunderbird 148.0.1 (64-bit). In Account settings>End-to-End encryption, I click Add Key>Import an existing OpenPGP key>Select File to import, and then I select the file.

I get an error message: Error! Failed to import file.

I'm surprised. I would think that going from one installation of Thunderbird to another would work this way. I am concerned that I won't be able to read incoming encrypted emails without the key working.

Can someone help me?

Ich habe eine Systemwarnung halten und habe versehentlich angeklickt. Defender hat einen Trojaner entdeckt. Dieser wurde entfernt. Jetzt wollte ich Firefox restaurieren. Wie ist das möglich. Was ist zu tun ?

After a usual, recent automatic Firefox update my passwords and other data (bookmarks, history etc) are missing. The update took place around March 4 and on March 10 I used Smart Switch by Samsung to transfer and sinc my phone data on my pc. After this operation I noticed the missing data and all attempts for the various methods to restore data were unsuccessful. Please advice on how to restore passwords etc..

on my desktop computer when i click on a message thete is another window to the right of the message withe the opened up message. I can't get this to happen on my laptop computer.