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Welcome to Thunderbird 140 “Eclipse”

55 responses

The wait is over! Thunderbird 140 “Eclipse” has reached totality. From all of us at the Thunderbird project, from MZLA staff and the Thunderbird Council to our global community of contributors, we’re excited to announce the latest Extended Support Release has arrived.

Eclipse not only builds on Thunderbird 128 “Nebula,” but also the recent features and improvements from the Monthly Release channel. This latest release transforms your email experience with adaptive dark messaging and improved visual controls. Enhanced features keep everyday email tasks light and effortless, while the streamlined new Account Hub ensures adding new accounts is a snap.

Dark Message Mode

Thunderbird’s Dark Mode now automatically adapts your messages when enabled, to ensure your Dark Mode experience stays totally dark. Need to bring your messages back into the light in case of visual problems? Adjust your message view as needed with a quick optional toggle.

Appearance Settings

Make Thunderbird yours across all your folders and accounts with a single click in the Settings (panel). Change your message list layout between Cards and Table view, adjust your Cards View, and set your default sorting order and threading options with ease.

Native OS Notifications

Leverage the speed and ease of your Operating System’s built-in notifications, whether you’re on Windows, Linux, or Mac. Quickly delete, archive, or use customizable actions directly from your notifications and get more done with your day.

Account Hub

Adding a new account to Thunderbird is now easier than ever. Connect all of your emails, address books and calendars in a few easy steps.

Manual Folder Sorting

Don’t like the order for your custom folders? Just click and drag to arrange them exactly how you want.

Don’t like the order for your custom folders? Just click and drag to arrange them exactly how you want.

More Refinements & Updates

Experimental Exchange Support Natively set up a Microsoft Exchange account in Thunderbird by enabling a preference.

Export for Mobile Generate a QR code to quickly transfer your account settings and credentials to your Thunderbird for Android app.

Horizontal Scroll for Table View Lots of tabular data? Let the message list scroll horizontally, like a spreadsheet or file manager.

Bug Fixes and Improvements

Thousands of bug fixes and performance improvements to bring you the smooth, reliable Thunderbird experience you expect.

Looking Forward

Whether you’re waiting for the next Thunderbird ESR or total solar eclipse, we understand that sometimes you want new features, or that cosmic awe, sooner. While we can’t change the universe, you can now get the latest Thunderbird features as they land, instead of once a year. Switch to Thunderbird Release and enjoy monthly updates with the same dependable stability.

Thunderbird 140 Availability For Windows, Linux, and MacOS

Even with QA and beta testing, any major software release may have issues exposed after significant public testing. That’s why we are slowly enabling automatic updates until we’re confident no such issues exist. We do have a known issue where users sending mail through 32bit MAPI will be prompted for a password, unless they use the compose window.

We have enabled manual upgrade to 140 via Help > About, and you can upgrade now or wait to receive automatic updates. Thunderbird version 140.0 is also offered as direct download from thunderbird.net. Be sure to select ‘Thunderbird Extended Support Release’ in the ‘Release Channel’ drop-down menu.

For Linux users running Thunderbird from the snap or flatpak, 140 will be available within the next few weeks. Likewise, Thunderbird 140 will also arrive on the Windows store by mid-July.

55 responses

marian wrote on

Experimental Exchange support is huge! Are shared mailboxes supported too?

Monica Ayhens-Madon wrote on

We talked to the team, and the answer is not yet. Some features might happen to work out of the box for shared mailboxes, but we haven’t experimented/tested to confirm any support (and looking at Microsoft’s docs there might be some additional work needed to properly support them). We’ll try to provide updates in our monthly development digests on this feature!

Samuel wrote on

Will the Thunderbird snap also switch to Thunderbird Release (monthly releases)? Right now the latest stable release for the snap is 128 ESR (specifically 128.12.0esr-1) and I have to use the beta channel to get version 141.

Monica Ayhens-Madon wrote on

We’re still working out how to manage ESR and the Release Channel on the snap, since many Linux users are often heavier Add-on users and not all Add-ons work on release. Once we have a solution in place, we’ll update everyone!

Óvári wrote on

Thunderbird for Linux Mint states “Updates disabled by your system administrator” in Help, About.

Can you please advise when Linux Mint 22.1 Cinnamon will receive Thunderbird 140?

Will Thunderbird 128, Thunderbird 140, or the Thunderbird Monthly Release channel be in the soon-to-be-released Linux Mint 22.2 Cinnamon?

Thank you

Monica Ayhens-Madon wrote on

We’ll get this question to our team re: updating in Mint. As for the latter question, that’s probably a good question for the Mint team, since every distro makes their own decisions about what they include as default!

ROZ wrote on

Android compatibility?❓❓‼️‼️

Monica Ayhens-Madon wrote on

We’ve had the Thunderbird for Android app available since last October! You can download it from the Google Play Store, F-Droid, or as an APK from GitHub. All the download options are available on our website: https://www.thunderbird.net/en-US/thunderbird/all/

Alan wrote on

Great news, thank you. it would be really great if monthly releases were available in flatpak.

Jim Horky wrote on

Thunderbird 140.0 esr (64 bit) Eclipse updated on 07 July 2025 without my knowledge. Now this morning I can only send emails and not receive. It continues to ask for password over and over. It has messed up something in the incoming server. I changed it from inbound to the pop.mail.yahoo.com just get it to request the password. Before that it just timed out never asking for PW. I need to either get the correct settings or go back to a previous version of Thunderbird which was working fine. My server is Yahoo mail. Do you have any ideas of what may be wrong?

Monica Ayhens-Madon wrote on

We’re so sorry this happened, and our support team and community volunteers would be happy to help troubleshoot these issues at https://support.mozilla.org/en-US/products/thunderbird – it’s easier for us to provide support there versus here on the blog!

Shashikanth wrote on

Looking to Migrate from Outlook at many customer installations, but new setup is OK, but importing from Current PST files has become a headache. Can this be sorted out so that we can come out of Outlook Nasty Issues.

Monica Ayhens-Madon wrote on

Unfortunately as these are Outlook-specific files, there’s no easy way to handle this. There was a recent related question in Mozilla Support that may have some possible solutions! https://support.mozilla.org/en-US/questions/1510014

David wrote on

Finally i don’t have to use an extension for dark mode 🙂

Allan Richardson wrote on

A more useful tool woukd be to create a “Starred” folder, analogous to the “Starred” folder in the ATT web interface and the “Flagged” folder in the iPhone mail app, containing all messages in the Invix that have the flag/star on them. Currently in Thunderbird, I have to resort the Inbox, find the starred messages, then resort again (twice; once by Date and then by Descending. Having the messages appear virtually in another folder would be much more useful.

Similarly, an Unread virtual folder would help to identify any messages that are NOT near the top (latest) of the list by date, that may have been accidentally skipped over.

Monica Ayhens-Madon wrote on

Thanks for your comment and feedback, and you can also make this suggestion at our official feedback site, Mozilla Connect, where other members of the community can upvote and comment on it: https://connect.mozilla.org

F wrote on

Very much looking forward to this upgrade! Patiently waiting for the flatpak to drop 😉

Fotis wrote on

Still no joy copying pasting tables from Excel.

Atsjo wrote on

Congratulation on a great new release, but why are you only showing low fidelity wireframes/illustrative graphics? Real screenshots would be better communicating what it really looks like, maybe the blog post can be updated?

Monica Ayhens-Madon wrote on

Thanks for the feedback, which we’ve given to them team, to let them know how much our community values screenshots! We’ll also talk about editing the blog to add screenshots.

Tom wrote on

Finally! An email client that lets me customise notification actions ❤️

Plaenkler wrote on

Love it keep it going!

Tim Griggs wrote on

Thanks for all your hard work! But where is the Help menu now?

Monica Ayhens-Madon wrote on

You’re so welcome! And the help menu is in the Thunderbird Menu (the hamburger menu in the upper right corner), as well as your system’s menu at the top of the app under Help.’

Thunder wrote on

Not a single screenshot?
Why waste time creating those stylised drawings to describe features instead of showing actual screenshots?
It usually means the UI is horrendous..
Why would I bother downloading it?

Monica Ayhens-Madon wrote on

Thanks for the feedback, and while this was an aesthetic decision, we’ve gotten the feedback to the team and will keep in mind our community and potential users do want to see screenshots of new features.

Emilie Rollandin wrote on

Thank you!

Kevin E wrote on

Thanks for your hard work, everyone.

Gabriel R. wrote on

Awesome!
#iwanttobelieve

Monica Ayhens-Madon wrote on

Thanks so much!

Carlos Jorge Gallo wrote on

He bajado el programa, colaboré con $ARS 7.000 y ahora no me permite instalarlo mi notebook. Seguramente es producto de alguna maniobra de Microsoft pero quizás Uds me puedar dar una ayuda

Monica Ayhens-Madon wrote on

Gracias por tu donación y sentimos mucho que tengas problemas con la instalación de la aplicación. Por favor, visita https://support.mozilla.org/es/products/thunderbird para abrir una pregunta de soporte con más información y capturas de pantalla para que nosotros y nuestra comunidad podamos ayudarte.

Thomas Hunter II wrote on

Why aren’t there any screenshots in this blog post?

Monica Ayhens-Madon wrote on

Thanks for the feedback on the post, which we’ve gone ahead and forwarded to the team!

Martin wrote on

TB 140 disabled few of my plugins and in about section showing beta channel.

It would be nice if users can have option of auto-update the program after new compatible version of some plugins is released and compatible with new version of TB. Otherwise low level non-IT stuff in companies starts to bombard IT-support with questions like “this plugin disapeared” or “not working anymore”.

I would also welcome, if TB makes periodically a contest for top 10 used plugins that users wants to integrate into Thunderbird.

I would imidiatelly recommend things like advanced signatures with quicktext plugin, DKIM verifier, some plugin for removing duplicate messages, filtaquilla adding new parameters for global filter, and some more.

TB team could make a revision of such TOP plugins, integrate them and make sure that they stay up to date with the core application so people doesn’t loose important functionality after every especially major update like those big updates in ESR channel.

Monica Ayhens-Madon wrote on

Thanks for your honest and thoughtful feedback, and we’ll get this to our team, especially our teammmate who works with add-on developers (and is one himself!).

Martin wrote on

Me too, flatpak is way too behind current stable version. Is there any way how choose between stable and ESR channel in TB from flatpak (flatub)?

Monica Ayhens-Madon wrote on

Right now, there isn’t, but that is something our team is looking into (how to have both ESR and Release available in snap and flatpak). We usually have a waiting period before updating to the new ESR in flatpak (and snap), since unlike other installs, everyone who installed from these packages is upgraded at once, instead of slowly upgraded over weeks.

Abraham wrote on

There is a big problem when adding new accounts, it takes ages to find imap settings while last version took only seconds.

Abraham wrote on

Also, when trying to add an account, i can see is processing, it’s been 10 minutes and still didn get to the part where i see the imap settings or input the password.
And i am unable to cancel the process or do anything, i have to close Thunderbird completely.

Monica Ayhens-Madon wrote on

We’re so sorry this is happening. Is this using the new Account Hub or the older system? If you open a support ticket at support.mozilla.org/products/thunderbird, we and our support community can help troubleshoot this in more detail!

Barbara wrote on

How do I make a new Message Rule in Thunderbird 140? I can’t find anything. I want the Taskbar back!

Monica Ayhens-Madon wrote on

In the top menu, click on Tools > Message Filters to create a new Filter (what we call rules).

Kerstin Ditschinger wrote on

Since updating to 140.0.1esr, I can no longer set up mailboxes. After entering the email address, the window changes. Thunderbird tries to retrieve the server information from an external source, and then the endless loading wheel appears. The only way to get rid of this is to quit Thunderbird via the Task Manager. Is there another way to set up mailboxes manually?

Monica Ayhens-Madon wrote on

We’re so sorry this is happening, and we’d like to help troubleshoot this in more detail with our support community at support.mozilla.org/products/thunderbird. We’ll also get this feedback to the team, to see what we need to investigate on our end.

SCOTT wrote on

MY “SENT” TO SENT FOLDER FOR AN E-MAIL IS NOT WORKING

Monica Ayhens-Madon wrote on

We’re so sorry this is happening! We’d be glad to troubleshoot this with the help of our community if you open a support question at https://support.mozilla.org/products/thunderbird – thanks!

SAAAAAA wrote on

System tray icon still not a thing in latest thunderbird for linux?

Monica Ayhens-Madon wrote on

This is something we’re very much working on to add more features. A good meta bug you could subscribe to in order to stay updated on progress is :https://bugzilla.mozilla.org/show_bug.cgi?id=1942125

Bob Plantz wrote on

“Natively set up a Microsoft Exchange account in Thunderbird by enabling a preference.” Where is this preference?

I’m running 140.0.1 on Windows 11 on two laptops. One uses TbSync just fine (with a hack in manifest.json files-changing strict_max_version to 140.*”), but it doesn’t work on the other. I copied the hacked files. Very weird.

Monica Ayhens-Madon wrote on

We chatted with the team, and we strongly recommend switching to the Release channel where Exchange email will soon be enabled and supported. Non-experimental Exchange native email will be in to next year’s ESR.

And we definitely recommend sharing feedback on Tbsync on its support page, so its developer can see it! https://github.com/jobisoft/TbSync/wiki

Jason Polak wrote on

I am very frustrated with the new Thunderbird. The new Dark Mode is too dark, and I have trouble reading my messages because the contrast is too high. In the old Thunderbird, it was possible to change the background so that it was a lighter grey, and now the dark mode overrides that. It is very frustrating and the option to customize the background color has been removed 🙁 🙁 🙁

I don’t understand why you would make it like this….it makes it harder for older people to read the messages.

Monica Ayhens-Madon wrote on

Thanks for your feedback, and we’re so sorry to hear that this change has decreased the the visibility. We’ll bring this feedback to our team, and for now we suggest turning off Dark Message Mode (or enabling the dark message mode toggle) in Settings > General > Reading and Display.

Derek H wrote on

I used to be able to keep my mail files (Receive AND Send across multiple addresses/accounts) synchronized between multiple home and traveling computers (Mac, Windows, and now Linux Mint) simply by copying the profile folder and adjusting the profiles.ini file.

I find now that if I try to do that, I get an error saying I’m trying to use a profile from an older version (I’m not, the current profile is from a MacBook Pro using version 140.01esr) and my only option is to build a new profile. Linux Mint on the standard install gave me 115.18.0+build1-0ubuntu0.22.04.1 while the Flatpak installation gave me 128.somethingorother and downloading directly from the Thunderbird website gave me 140 but all three versions on Linux gave me the same error.

If I understand the file structure correctly, I could just copy the Mail subdirectory and that should keep my Sent and Received emails synchronized but I’ll still have to create a profile on each new computer AND recreate all the logins and server information for each mail account as well as redo filters and anything else I want to keep from my main home computer. Is there a better way?

Monica Ayhens-Madon wrote on

We’re sorry to hear you’re having these errors, and this is part of what SYnc will fix when it’s released, which right now looks like next year. For now, we suggest going to https://support.mozilla.org where our support team and community volunteers can offer more in-depth help and troubleshooting!

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