Thunderbird Community Forum

I've been using Thunderbird for many years. My current version is 45.2.0. My computer runs Linux Kubuntu 15.10

So yes, it's ten years old and it's showing its age. I have a new box I built, and have Kubuntu 25.04 installed. It installed the then current version of TB. I have yet to set things up, but migrating is a priority now.

Some solutions say (on ubuntu/kubuntu) to just copy the directory "/home/username/.thunderbird/profile.default" from the old to the new box. I would likely do it by zip, rar or ssh transfer.

If I do that, when opening up TB on the new box, does the data get converted? and if so, is it automatic? It seems to me that after then years, the data format would have some changes.

I'd appreciate any insight on this. Thank you.

I recently upgraded Thunderbird from v140.7-ESR to v147-Release and would be grateful if someone could answer some questions.

After upgrading I noticed there are 3 profile folders even though I am the only user of my Win11 laptop.

Profile Folders 92yfgi88.default-esr - 3.654 GB - 2026/01/23 12:50:27 >> My profile jf63jfuk.default-default - 1.533 GB - 2024/06/05 21:27:32 y9efj7q9.default - 47 Byte - 2026/01/23 12:30:15

The folder y9efj7q9.default only contains 2 files - parent.lock (0kb) and times.json (1kb).

1. Can I safely delete profiles I don't use?

2. Why is -ESR still shown at end of my profile folder name? - I thought it would be renamed when I changed to the release channel version.

3. Can I manually rename my profile folder? - I know I can rename a profile using Profile Manager but this doesn't rename the folder.

4. If not possible to rename my "92yfgi88.default-esr" folder, I assume I can just copy it's contents to another new profile folder and tell TBird to start using that?

5. Can I use Windows File Explorer to delete/rename profiles, or must this be done from within Thunderbird?

Also, any idea why Thunderbird Notifications still show as coming from Mozilla Thunderbird ESR, even though I now use the Release version? I've checked Windows 11 System > Notifications and it is still shown there as Mozilla Thunderbird ESR.. Why? and how to fix?

Thanks in advance..

I have 4 IMAP accounts and 1 local account. I would expect them to be shown as account 1,2,3,4,5, but Thunderbird's troubleshooting info shows them as 1,2,5,7,8. Please see attached picture.

Any idea why? Has something gone wrong? They all seem to be working ok.

bold text As a message was being sent I tried to save it before the message was completely sent.

When the dust cleared all of my saved messages are gone in all folders and subfolders.

I closed Thuderbird and reopened it. - no saved messages.

I restarted my Macbook Air and opened Thunderbird - no saved messages.

All software was up to date. All other programs seem to be OK.

Now what?

Jeg har modtaget en mail som jeg vil videresende til en anden person. De modtagene mail ser sådan ud se billede Skærmbillede 2026-01-28 152737.jpg Når jeg sende denne besked videre kommer der først en lang teknisk liste, se skærmbillede Skærmbillede 2026-01-28 153123.jpg

Hvordan undgår jeg at få al den unødvendig information ?

Med venlig hilsen Michail Grunnet mobil 40559069

I have 2 parallel accounts with the same ISP. As of 2 days ago, whenever I try to send mail, I get this message: “Sending of the message failed. An error occurred while sending mail. The mail server responded: Command rejected. Please verify that your email address is correct in your account settings and try again.” I receive mail as normal. Using the other address with exactly the same settings allows me to send normally as I have for the past ten years! Nothing appears different anywhere in the settings. There were no upgrades that I am aware of. I have since found that I can send from my basic little "travel" computer without issue. Any ideas? BTW, using POP mail settings.

Good Afternoon Theres 2 accounts under the same username.One is working fine and the other one displays the error notification "Failed to connect to server mackie. when I press on inbox. What confuses me is that it has the same names but has different folders underneath it.I need the one that displays the error messages to be fixed.

I had an account gmail in thunderbird I lost it because I had to change the password and did not find to change it in thunderbird. I want to add this account in thinderbird but did not succeed. Can you tell me all what to do, I had always a window of Google that open but I do not understand what to do with it.

Hello,

As per title, when I step on a new message not belonging to the first thread, the first thread expands automatically. This does not happen when I step on an already read message. I also tried to mark old messages as unread, and the same thing happens. Apparently, it started doing this today, which sounds weird as thunderbird last updated on the 15th, but I didn't notice this type of behaviour before today.

Thunderbird version: Thunderbird Windows MSIX package 1.0 - 140.7.0esr (64 bits)

Vertical view - Cards view

I'm trying to set up my thunderbird client (Version 147.0) to work with my Google Workspace. I understand that I should choose OAuth as the login method. The problem is that the option is not available when I try to create the account. There are only "normal password", "Encrypted password", "Kerberos/GSSAIP", "NTML" and "TLS certificate". What am I doing wrong?

Hi. I'm using Thunderbird for my POP account and it has stopped sending messages. It just says, Sending of the message failed. Peer's certificate has expired. The configuration related to (my server name) must be corrected. What am I to do?