Thunderbird Community Forum

Every time I open Mozella the above pops up, I can still receive and send emails and every thing seems to work ok, not being computer savvy should I be concerned? Any help and suggestions would be great Many thanks Charmayne

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

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 am using 64bit Windows 11 Home. This happened suddenly without any changes on my part that I know of.

Thunderbird suddenly started freezeing right after startup. The only thing I can do is login with the master password then the regular thunderbird screen opens, but I cannot click on anything. Soon after the screen is greyed out. However I can close the program down with the red "x" in the top right corner. It opens a dialog that gives me the opens to close down or wait to respond. The close option works.

The only hint I can see from the frozen screen is that the local Folder seems to have a problem as a subfolder has now multiple copies of itself. It seems to create a new copy of that subfolder every time I try to start the program.

So far I tried reinstalling/updating TB, as I assumed an update had maybe malfunctioned, (it was stuck on version 128, since I could not open TB for about a week now) but upgrading to to version 138 did not help. I also tried starting TB in troubleshoot mode, which made no difference I also tried starting TB while windows was in safe mode, which made no difference.

I read around but people that have problems with TB freezing seem to not have the freeze happen before they can do anything.

I assume something is wrong in my profile, maybe the local folder? But I have no idea to fix anything, since I cannot do anything at all in TB.

Any help would be appreciated! Thanks!

Thunderbird has become a pain now for a number of months- regardless of any updates. On first start up if I click on anything on Thunderbird before ALL email accounts have completely finished downloading, Thunderbird locks up and displays not responding on the top of the screen. I have to wait ten minutes and longer before I can start reading a email until every email on every email account has finished downloading. When a site says it is sending a verification email - before I can see that email when I start Thunderbird - the verification email needs to be resent because it has run out of time. This never happened a year ago - now it is daily! I don't know what Mozilla is doing to Thunderbird but it is now highly unreliable! If it was not the only free email client software I would have dumped it by now. Why is it doing this?

Yesterday and today has just been a nightmare. But I'm slowly getting things back up and connected after Hostway absorbed my hosting company (HostMySite) and migrated everything to their servers, but forgetting to send me the new login info until after they had terminated my old e-mail servers. And then it just got worse.

I am using Thunderbird 102.15.1 64-bit on a M1 mac. Do not tell me to upgrade. I did, once, and revised search functionality literally had me spending 3 days to manually revert my entire database back to work with 102.15.1. New version - bad. No.

The thing I need help with is that, as I reconnect my e-mails to Hostway's servers, I can get e-mails, but the collected Inbox does not show anything new. When I select a specific account within the collected Inbox, it'll have 10 new e-mails, but the collected Inbox- nothing new.

Same with all the collected folders, Drafts, Sent, Junk, trash, etc.

How doI get the collected folders to work again?

In Thunderbird, when I hit "get messages" it replies"Enter your password" Now, without my changing anything, it no longer recognizes the p/w. When I repeat, it replies"....too many commands before authf7mb153666557ooe". I'm using the same configuration i have always used: pop.gmail, SSL/TLS, normal password. I have tried changing this config within the limits of what Thunderbird Account setting offer but to no avail. Also tried on gmail security settings "allow less secure app access" - also no result

I have added a certificate to the Thunderbird Certificate Manager (localcert.png), with the info as shown in certdetails.png. However, Thunderbird is not sending the certificate. I have "When a server requests my personal certificate" set to "Ask me every time". I also tried choosing "Select one automatically" but that did not change the result.

However, my mail server, which uses TLS client certificates as one factor in sender authentication says: May 27 02:00:05 Mercury2 smtpd[9850]: b972fe936721dfe0 smtp disconnected reason="io-error: handshake failed: error:0A0000C7:SSL routines::peer did not return a certificate"

What am I doing wrong in the config that is causing Thunderbird to not send the certificate?

Details of SW in use: OS Ubuntu 24.04.2 LTS Mail server OpenSMTPD opensmtpd-7.6.0,1 on FreeBSD Thunderbird 128.10.2esr (64-bit) installed from snap $ snap info thunderbird name: thunderbird summary: Mozilla Thunderbird email application publisher: Canonical✓ store-url: https://snapcraft.io/thunderbird contact: https://www.thunderbird.net/contact/ license: unset description: |

 Thunderbird is a free email application that’s easy to set up and customize
 - and it’s loaded with great features!

commands:

 - thunderbird

snap-id: k1Ml1O9GzSO2QftV0ZlWSbUfQ78nN460 tracking: latest/stable refresh-date: 3 days ago, at 10:48 MDT channels:

 latest/stable:    128.10.2esr-1 2025-05-23 (734) 220MB -
 latest/candidate: 128.11.0esr-1 2025-05-23 (735) 220MB -
 latest/beta:      139.0b4-2     2025-05-20 (731) 236MB -
 latest/edge:      ↑                                    

installed: 128.10.2esr-1 (734) 220MB -

Several years ago, I switched over to the beta path of Thunderbird... In doing so, I created a new profile for the beta installation, leaving the old one behind in case I wanted to abandon beta... So I had two profile folders; I *thought* they were this:

current profile: c:\notes\Thunderbird original backup profile: c:\notes\Thunderbird.b115

Now, I've decided that there is no reason to retain the old Thunderbird profile folder, since I'm clearly committed to the beta path... however, I have discovered an anomaly... *both* the old and new profiles are periodically being updated!! Thunderbird.b115 is apparently actually my active profile, but Thunderbird was updated just a few days ago.

When I look at About Profiles, I actually see *three* profile folders listed:

Profile: Gorlash: (default: no) c:\notes\Thunderbird

Profile: Derell Licht beta: (default: no) c:\notes\Thunderbird

Profile: Thunderbird beta (default: no) c:\notes\Thunderbird.beta (note that this folder does not exist)

Profile: Thunderbird b115: (default: yes) c:\notes\Thunderbird.b115

===========================================

Is there something that I could do to consolidate all of this into just one folder? I don't even *know* what those Gorlash and Derell Licht profiles refer to... Yes, those are both usernames that I use online, in various contexts, but as far as I know, I don't use them in Thunderbird...

Q1: Can I just delete those other profiles where default is NO ?? Q2: Why is c:\notes\Thunderbird still getting periodic updates, even though those profiles are not default??

Hello,

I'm running TB128 under Windows 11. I had a boot problem, restored a recent image, and now, when I attempt to launch TB, I get the error below, telling me that a newer version of TB may have made changes to my profile, and that I'm running an incompatible, older version of TB. I've experimented with this situation until my fingers are bleeding, but can't open TB using my newly restored profile.

Any assistance is most appreciated, Lothar

yes, so the title gives the question.

when I start the thunderbird app on windows 10 laptop it starts to fetch 2000+ emails from google. Everytime even after letting it go through the process.

Its super slow and always reports its stuck at 2 out of 2000+ emails. Very strange.

I have let it run for 24 hours+ on one occation to get everything loaded. The loading status bar disappeared but it restarts everytime I open the app again.

Any idea why?

Best regards,

Oskar

This app comes with lots and lots of updates, and every time I have to delete the old start icon on the task bar and re-pin it. Please, fix it so that I never have to do that again. There is no other software at all including Mozilla Firefox that does this to me.

There is no longer a need to keep the portable Thunderbird alongside the desktop version. So I thought I should transfer all data from portable into the desktop version. I already have several email accounts in the desktop version and unsure if I can simply use the desktop's import tool to bring in all data from the portable version. Can anyone confirm?

Hello,

Since updating to Thunderbird 139, I’ve encountered a persistent issue with the dark theme in the reply composer. When replying to HTML messages, the text appears black on a dark background, making it nearly unreadable.

This issue did not occur in Thunderbird 138 — nothing else changed on my system except the automatic update.

Here’s what I’ve tried:

- Verified that toolkit.legacyUserProfileCustomizations.stylesheets is set to true in about:config.

- Created and edited a userContent.css file inside the active profile folder.

- Used various CSS rules targeting messengercompose.xhtml to override text and background colors (e.g. forcing color: #ddd and background-color: #000).

-Tried resetting composition preferences like msgcompose.background_color and msgcompose.text_color in prefs.js.

- Set Thunderbird to use plain text composition, which works — but this is only a temporary workaround.

- Ensured that no conflicting extensions (e.g. DeepDark) are enabled.

-Confirmed the issue happens even with a clean profile. - Manually set the default text and background colors to white on black in the composition settings — but replies still render with black text on black background.

The problem seems to be that Thunderbird 139 overrides the user-defined dark theme or does not apply CSS properly in replies.

Is this a known regression? Is there any workaround to enforce dark-compatible colors in HTML reply composition without switching to plain text?

Thanks for your help.

Daniele

Have been currently using Thunderbird (Release 128.11.0esr (64 Bit)) on a desktop over the last 10-12 years. I have now updated my PC and want to transfer the existing software and all the stored emails to the new PC which is running on Windows 11.

How can I do this please?

I used to use Mailspring and loved it's combined inbox. Incoming messages for both of my email accounts would show in a combined inbox. I like Thunderbird and wish it had a combined inbox.Do we think it will ever happen?

Receiving the following message. Changed nothing. Just stopped working. All other portable devices working fine.

The RETR command did not succeed. Error retrieving a message. Mail server outlook.office365.com responded: Server Unavailable. 21

Has anyone seen this or have a solution? Thank you.