Thunderbird Community Forum

I am using MacOS 10.13, Thunderbird 115.15.16ESR: my Hotmail worked until 15 May 2025 and then it would not download new emails. Screenshots are available if you want me to post them. I got an error message: "authentication failure while connecting to server outlook.office365.com". I updated Thunderbird to the latest for my OS: 115.18.0ESR. Still no new emails. I deleted my email account on Thunderbird and tried to reinstate it. Now I get an error message when trying to set up the account: "Unable to log in at server. Probably wrong configuration, username or password." I tested my password by logging into my Microsoft account with it on my browser. I can also login to my email using Firefox, but I want my Thunderbird email client to work again.

The configuration I am using is: I use my normal hotmail password in the password field. I also set up a new App Password with Microsoft and tried that without success. With the 115.18 update there is a new field: Your login. I just put my hotmail email address in here. incoming: outlook.office365.com, port 993, SSL/TLS, Oauth2 
outgoing: smtp.office365.com, port 587, STARTTLS, Oauth2 (I have also tried: smtp-mail.outlook.com)

I enabled 2-step authentication with Microsoft in my Microsoft account more than a year ago. Interestingly, I don't get a prompt on my iPhone Microsoft Authentication App when I select Done when trying to set up the hotmail account on Thunderbird.

Please help. I am desperate, and I have wasted a lot of time on this without success. Cheers

For some reason some important emails are now regularly going straight to deleted before I've even seen them. Luckily I know to keep an eye on them but how do I go about rectifying this please.

Thunderbird is time-stamping emails I send and receive in a different time zone. How do I change the time zone it is using? I'm using 128.10.0esr (64-bit) on a Macbook running Sequoia 15.4.1.

Thanks in advance for any assistance.

New incoming emails are no longer marked as "unread" and In bold print when they arrive. I have to manually mark them as unread. Then when I read them, they do not consistently change to "read". This was not a problem until I started using the 128.10.0esr (64-bit) version of Thunderbird.

I recently had to do a clean install of Windows 11. I followed the instructions on how to save Thunderbird info to be entered back into Thunderbird once I was up and running again. Well I'm up and running and am trying to install Thunderbird. Thunderbird sees me from before I did the install of Windows 11 and is setting me up without me doing anything, until it came to password time....... I do save my passwords but cannot find one for Thunderbird. I do have on for Firefox. I tried creating a new password but Thunderbird isn't accepting it. I don't see any "if you forgot your password" choices that you normally see. How do I either change my password or get hints on what the old one is?? I might need help on installing the info I saved before the Windows install.

OS is Kubuntu 24. TB version is 139. Password was working on the ESR version, but once I upgraded to 139, my password no longer works. I tried going back to the ESR version, but now the password doesn't work on ESR as well. Help ! Email is phlag311@att.net

I am trying to upgrade from 128 esr version to the new 139 version. I tried several ways to transfer data from the old version to the new version - I tried to export and import a the Thunderbird zip file. I also tried to open profile manager and creating a new profile that refers to a copy from my old version. Nothing has worked. In the old Thunderbird 128 version, if I select Help and Troubleshooting Information and then Open Folder next to the Profile Folder I get an error in Thunderbird that it can’t find my profile. I get the same error message when I go to Tools, export and select "open profile folder." This in spite of the fact that the old version continues to correctly display my contacts, tasks and events

After several hours of this, I finally decided to download version 139 using the standard Mozilla set up even though my Thunderbird 128 version is located someplace else. So, at this time I have two working versions of thunderbird on my computer – the old 128 version with all my data and the new 139 version with no data.

I think I need help figuring out which Profile has my contact, calendar and task data. Then I need help getting it to the new version.

Thanks

Luke

I created a POP3 Gmail account but It doesn't appear to be syncing with the address book. Or at least I see no evidence of it. Is syncing Gmail contacts only available when Gmail is set to imap?

James

Linux mint 128.10.2esr (64-bit) Thunderbird email. I'm having a problem, not able to move I MAP mail from inbox to local folder, I get no message and there is nothing in local folder after I've tried to do the move.

NAME="Linux Mint" VERSION="22.1 (Xia)" ID=linuxmint ID_LIKE="ubuntu debian" PRETTY_NAME="Linux Mint 22.1" VERSION_ID="22.1"

Thunderbird for Linux Mintmint-001 - 1.0

Linux area51 6.8.0-60-generic #63-Ubuntu SMP PREEMPT_DYNAMIC Tue Apr 15 19:04:15 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

I set up a CardDAV addressbook link to my iCloud addressbook. Everything is fine, and syncing works great. After ~2 days, it stops working and I have to generate a new app-specific password, delete my addressbook, and re-establish a new link with the new app-specific password. I tried to turn on CardDAV login, but nothing it written to the logs.

Has anyone run into this problem and how do I go about troubleshooting it?

Hello, Please Help! I turned on my laptop to check email this morning and tapped on my Thunderbird shortcut and it no longer worked. When I looked for the Icon on the desktop to open it, Thunderbird was gone. How do I recover it? I had 4 different email accounts on it. Lots of important saved information. Please advise, Lisa Lundgren

Over the last two years Thunderbird on my main PC fails to synchronise mails in the Sent box, sent from two other PCs and an Iphone. I use IMAP mail accounts on a Zimbra platform. In the advanced Synchronisation tab, Sent is included in offline use. What do I get wrong? Although I am a longtime user, I am not an expert. Thanks in advance, Ad

Could you please help me to change incorrect folder name. The properties tab has the folder name in Cyrillic. In the folder pane, the folder address is shown instead of the folder name. Во вкладке свойства есть имя папки на кириллице. В панели папок вместо имени папки показывается её адрес. Подскажите, пожалуйста, как исправить.

Hello, I am using Kubuntu 24.04.2 LTS on a Lenovo T470. After a regular installation of updates via Discover three days ago, thunderbird can no longer be started via the icon in the window bar (message: KDE -Plasma workspace: The file or folder /snap/thunderbird/644/usr/lib/thunderbird/thunderbird-bin does not exist).

I was able to start thunderbird via the menu (the location now appears to be /snap/bin/thunderbird), but the profile and all mails have disappeared, as if I had reinstalled thunderbird.

The Personal folder/snap/thunderbird folder contains the folders 721, 734, common and current. Only common has something, but very little content (25 MB).

I set up my profile again in the post-update thunderbird (no problem thanks to imap-server), which works well. However, now I have two icons: If I click icon no 1, thunderbird starts as a new installation without any profile and mails, icon 2, thunderbird starts with my profile.

Can anyone make sense of this strange behavior?