The first Mobile Progress Report of 2026 provides a high-level overview to our mobile plans and priorities for the coming year. Android Our primary focus this year revolves around a better user experience and includes a major push to improve quality. We want to make the app stable, reduce our bugs, and speed up our […]

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Welcome back to the Thunderbird blog and the first post of 2026! We’re rested, recharged, and ready to keep our community updated on all of our progress on the desktop and mobile clients and with Thunderbird Pro! Hello again from the Thunderbird development team! After a restful and reflective break over the December holidays, the […]

The post Thunderbird Monthly Development Digest: February 2026 appeared first on The Thunderbird Blog.

2025 was an exciting year for Thunderbird. Many improvements were shipped throughout the year, from faster updates with a new release cadence, to a modernized codebase for the desktop app. We made big strides on our mobile apps and introduced the upcoming Thunderbird Pro to the world. As we wrap up the year, a huge […]

The post Thunderbird 2025 Review: Building Stronger for the Future appeared first on The Thunderbird Blog.

Hello again from the Thunderbird development team as we start to wind down for the holidays! Over the past several weeks, our sprints have been focused on delivery and consolidation to clear our plates for a fresh start in the New Year.  Following our successful in-person work-week to discuss all things protocol, we’ve brought Exchange […]

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Welcome to the last Community Office Hours of 2025! In this edition, Heather and Monica welcome Sr. Software Engineer Brendan Abolivier and Software Engineer Eleanor Dicharry from the Desktop Team. We’re discussing the recent Exchange Web Services Support for email that just landed in Thunderbird Monthly Release 145. Learn how the team landed this feature […]

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As we get ready for the Thunderbird Pro launch, we want every service we offer to be secure and worthy of the trust our community places in us. That means being honest about where we stand today and the work we are doing to meet the promises we are making. Recently we partnered with OSTIF, […]

The post Thunderbird Send Security Audit with OSTIF and 7ASecurity appeared first on The Thunderbird Blog.

Welcome back to the latest State of the Thunder. In the last Community Office Hours, Heather and Monica sat down with members of the mobile team in a retrospective to celebrate the first year of the Thunderbird for Android app. In this recording, however, Alessandro is leading viewers through the upcoming mobile roadmap, both for […]

The post State of the Thunder 14: The 2026 Mobile Roadmap appeared first on The Thunderbird Blog.

Welcome back to the latest update on our progress with Thunderbird Pro, a set of additional subscription services designed to enhance the email client you know, while providing a powerful open-source alternative to many of the big tech offerings available today. These services include Appointment, an easy to use scheduling tool; Send, which offers end-to-end […]

The post Thunderbird Pro November 2025 Update appeared first on The Thunderbird Blog.

If your organization uses Microsoft Exchange-based email, you’ll be happy to hear that Thunderbird’s latest monthly Release version 145, now officially supports native access via the Exchange Web Services (EWS) protocol. With EWS now built directly into Thunderbird, a third-party add-on is no longer required for email functionality. Calendar and address book support for Exchange […]

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If you can believe it, Thunderbird for Android has been out for just over a year! In this episode of our Community Office Hours, Heather and Monica check back in with the mobile team after our chat with them back in January. Sr. Software Engineer Wolf Montwé and our new Manager of Mobile Apps, Jon […]

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A Brief Self-Introduction Hello community, it’s a pleasure to be here and help take part in a product I’ve used for many years, but now with the focus on Mobile.  I am Jon Bott, and am the new Engineering Manager for the Thunderbird Mobile teams.  I am passionate about native mobile development and am excited […]

The post Mobile Progress Report: September-October 2025 appeared first on The Thunderbird Blog.

Extensions make Thunderbird truly yours, moving at your pace and reflecting your priorities. Thunderbird’s flexibility means you can tailor the app to how you actually work. We’ll cover tools for efficiency, consistency, and visibility so every send is faster and better informed, your future self will thank you. Clippings We’ve all been there, retyping the […]

The post Your Workflow, Supercharged appeared first on The Thunderbird Blog.

Hello again from the Thunderbird development team! This month’s sprints have been about focus and follow-through, as we’ve tightened up our new Account Hub experience and continued the deep work on Exchange Web Services (EWS) support. While those two areas have taken centre stage, we’ve also been busy adapting to a wave of upstream platform […]

The post Thunderbird Monthly Development Digest: September 2025 appeared first on The Thunderbird Blog.

Welcome back to our thirteenth episode of State of the Thunder! Nothing unlucky about this latest installment, as Managing Director Ryan Sipes walks us through how Thunderbird creates its roadmap. Unlike other companies where roadmaps are driven solely by business needs, Thunderbird is working with our community governance and feedback from the wider user community […]

The post State of the Thunder 13: How We Make Our Roadmap appeared first on The Thunderbird Blog.

The past twelve months have been another remarkable chapter in Thunderbird’s journey. Together, we started expanding Thunderbird beyond its strong desktop roots, introducing it to smartphones and web browsers to make it more accessible to more people. Thunderbird for Android arrived in the fall and has been steadily improving thanks to our growing mobile team, […]

The post State Of The Bird 2024/25 appeared first on The Thunderbird Blog.

Welcome back to another edition of the Community Office Hours! This month, we’re showing you our first steps towards a long awaited feature: a genuine Conversation View! Our guests are Alessandro Castellani, Director of Desktop and Mobile Apps and Geoff Lankow, Sr. Staff Software Engineer on the Desktop team. They recently attended a work week […]

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Hello again from the Thunderbird development team! As autumn settles in, we’re balancing the steady pace of ongoing projects with some forward-looking planning for 2026. Alongside coding and testing, some of our recent attention has gone into budgets, roadmaps, and setting priorities for the year ahead. It’s not the most glamorous work, but it’s essential […]

The post Thunderbird Monthly Development Digest: August 2025 appeared first on The Thunderbird Blog.

We’re back with our twelfth episode of the State of the Thunder! In this episode, we’re talking about community initiatives, filling you in on Android development, and finishing our updates on popular Mozilla Connect requests. Want to find out how to join future State of the Thunders? Be sure to join our Thunderbird planning mailing […]

The post State of the Thunder 12: Community, Android, and Mozilla Connect appeared first on The Thunderbird Blog.

Hello wonderful community, it has been a while since the last Mobile update. A lot has happened in the past 2 months, so let’s jump right into a quick overview of current work in progress and primary efforts. Account Drawer in progress If you’re rocking the Beta version of Thunderbird for Android, you might have […]

The post Mobile Progress Report – July/August 2025 appeared first on The Thunderbird Blog.

Welcome back to the latest season of State of the Thunder! After a short break, we’re back and ready to go. Michael Ellis, our Manager of Community Programs, is helping Alessandro with hosting duties. Along with members of the Thunderbird team and community, they’re answering your questions and keeping everyone updated on our roadmap progress […]

The post State of the Thunder: Mozilla Connect Updates appeared first on The Thunderbird Blog.

Welcome back to another edition of the Community Office Hours! This month, we’re taking a closer look at accessibility in the Thunderbird desktop and mobile apps. We’re chatting with Rebecca Taylor and Solange Valverde, members of our designer, about a recent accessibility (often shortened as a11y) study. We wanted to find out where Thunderbird was […]

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We’re back with another exciting Monthly Release recap! Thunderbird 142.0 brings a host of user-requested features and important bug fixes that make your email experience smoother and more reliable. From better folder management to smarter PDF handling, this release focuses on the details that matter most to your daily workflow. A quick reminder – these […]

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In April of this year we announced Thunderbird Pro, additional subscription services from Thunderbird meant to help you get more done with the app you already use and love. These services include a first ever email service from Thunderbird, called Thundermail. They also include Appointment, for scheduling meetings and appointments and Send, an end-to-end encrypted […]

The post Thunderbird Pro August 2025 Update appeared first on The Thunderbird Blog.

Hello again from the Thunderbird development team! As the northern hemisphere rolls into late summer and the last of the vacation photos trickle into our chat channels, the team is balancing maintenance sprints with ongoing feature-related projects. Whether you’re basking in the sun or bundled up for a southern winter, we’ve got plenty to share […]

The post Thunderbird Monthly Development Digest – July 2025 appeared first on The Thunderbird Blog.

David Allen’s “Getting Thing Done” (GTD) system has been around for longer than Thunderbird! First published in a book of the same name in 2001, this approach to productivity is focused on freeing your brain from chaos, giving it “focus, clarity, and confidence” for creativity and new ideas. As I’m also a fan of freedom […]

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We’re launching a brand new series that will highlight features and improvements with Thunderbird 141.0 – your front row ticket to Thunderbird’s monthly enhancements! (No more waiting in the wings so to speak). Learn what’s new, why it matters, and how it’ll transform your inbox experience. In March, we introduced a new monthly Release channel […]

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For the past few months, we’ve been talking about our roadmaps and development and answering community questions in a video and podcast series we call “State of the Thunder.” We’ve decided, after your feedback, to also cover them in a blog, for those who don’t have time to watch or listen to the entire session. […]

The post State of the Thunder: Answering Community Questions! appeared first on The Thunderbird Blog.

Community First Thunderbird is (and has always been) powered by the people. The project exists because of the amazing community of passionate code contributors, bug-bashers, content creators, and all-around wonderful humans who have stood behind it and worked to support and maintain it over the years. And as the Thunderbird community grows, we want to […]

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Welcome back to another edition of the Community Office Hours! This month, we’re taking a closer look at Thunderbird 140.0 ESR “Eclipse,” our latest Extended Support Release! Sr. Manager of Desktop Engineering Toby Pilling (who so helpfully provides the Thunderbird Monthly Development Digest) is walking us through the latest Thunderbird. He’ll let us know what’s […]

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Welcome back to another update on how things are going on mobile.  Thunderbird for iOS We’ve been going back and forth between database and JMAP for Thunderbird for iOS. Most of the visible work has flown into creating an initial JMAP library that we can use to access the parts that we need from Thunderbird […]

The post Mobile Progress Report – June 2025 appeared first on The Thunderbird Blog.

Hello once more from the Thunderbird development team! For many of our team members, the summer has started with our annual sprint to release ESR and enjoy a little time afk, as our colleagues in the southern hemisphere hunker down for winter and power through a pile of work down under. Extended Support Release is […]

The post Thunderbird Monthly Development Digest – June 2025 appeared first on The Thunderbird Blog.

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 […]

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Thunderbird for iOS We’re growing a few more stars! We’re so happy to hear there is great interest in Thunderbird for iOS, and hope to reach a stage soon where you all can be more involved. Thank you, also, to those of you who’ve submitted an increasing number of ideas via Mozilla Connect. Todd has […]

The post Thunderbird Mobile Progress Report: May 2025 appeared first on The Thunderbird Blog.

It’s been just over two months (!) since we first announced our upcoming Thunderbird Pro suite and Thundermail email service. We thought it would be a great idea to bring in Chris Aquino, a Software Engineer on our Services team, to chat about these upcoming products. We want our community to get to know the […]

The post VIDEO: Thunderbird Pro and Thundermail! appeared first on The Thunderbird Blog.

In this month’s Community Office Hours, we’re chatting with our director Ryan Sipes. This talk opens with a brief history of Thunderbird and ends on our plans for its future. In between, we explain more about MZLA and its structure, and how this compares to the Mozilla Foundation and Corporation. We’ll also cover the new […]

The post VIDEO: Talking MZLA with Ryan Sipes appeared first on The Thunderbird Blog.

Here is an update of what Thunderbird’s mobile community has been up to in April 2025. With a new team member, we’re getting Thunderbird for iOS out in the open and continuing to work on release feedback from Thunderbird for Android. The Team is Growing Last month we introduced Todd and Ashley to the MZLA […]

The post Thunderbird for Mobile April 2025 Progress Report appeared first on The Thunderbird Blog.

Hello from the Thunderbird development team! With some of our time spent onboarding new team members and interviewing for open positions, April was a fun and productive month. Our team grew and we were amazed at how smooth the onboarding process has been, with many contributions already boosting the team’s output. Gearing up for our […]

The post Thunderbird Monthly Developer Digest – April 2025 appeared first on The Thunderbird Blog.

In this month’s Community Office Hours, we’re chatting with Vineet Deo, a Software Engineer on the Desktop team, who walks us through the new Account Hub on the Desktop app. If you want a sneak peak at this new streamlined experience, you can find it in the Daily channel now and the Beta channel towards […]

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Hello, everyone, and welcome to the Thunderbird for Android March 2025 Progress Report. We’re keeping our community updated on everything that’s been happening in the Android team, which is quickly becoming a more general mobile team with some recent hires. In addition to team news, we’re talking about our roadmap board on GitHub. Team Changes […]

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Hello again Thunderbird Community! It’s been almost a year since I joined the project and I’ve recently been enjoying the most rewarding and exciting work days in recent memory. The team who works on making Thunderbird better each day is so passionate about their work and truly dedicated to solving problems for users and supporting […]

The post Thunderbird Monthly Development Digest – March 2025 appeared first on The Thunderbird Blog.

Today we’re pleased to announce what many in our open source contributor community already know. The Thunderbird team is working on an email service called “Thundermail” as well as file sharing, calendar scheduling and other helpful cloud-based services that as a bundle we have been calling “Thunderbird Pro.” First, a point of clarification: Thunderbird, the […]

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In this month’s Community Office Hours, Laurel Terlesky, Design Manager, is talking about the new Thunderbird Design System. In her talk from FOSDEM, “Building a Cross-Platform, Scalable, Open-Source Design System,” Laurel describes the Thunderbird design journey. If you are interested in how the desktop and mobile apps have gotten their new look, or in the […]

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Hello again Thunderbird Community! Despite the winter seeming to last forever and the world being in a state of flux, the Thunderbird team has been hard at work both in development and planning strategic projects. Here’s the latest from the team dedicated to making Thunderbird better each day: Monthly Releases are here! The concept of […]

The post Thunderbird Monthly Development Digest – February 2025 appeared first on The Thunderbird Blog.

Hello, everyone, and welcome to the first Android Progress Report of 2025. We’re ready to hit the ground running improving Thunderbird for Android experience for all of our users. Our January/February update involves a look at improvements to the account drawer and folders on our roadmap, an update on Google and K-9 Mail, and explores […]

The post Thunderbird for Android January/February 2025 Progress Report appeared first on The Thunderbird Blog.

The monthly Release channel is ready to help you move from annual to monthly updates in Thunderbird. This update lets you know how to switch from the annual update (ESR) to monthly updates (Release), why you might have to wait, and what features you’ll get first! How do I switch from annual to monthly updates […]

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Hello again Thunderbird Community! As January drew to a close, the team was closing in on the completion of some important milestones. Additionally, we had scoped work for our main Q1 priorities. Those efforts are now underway and it feels great to cross things off the list and start tackling new challenges. As always, you […]

The post Thunderbird Monthly Development Digest – January 2025 appeared first on The Thunderbird Blog.

UPDATE (March 4, 2025): The Release Channel is now default! See our update post on how to make the switch with a manual install and what’s new in 136. We have an exciting announcement! Starting with the 136.0 release in March 2025, the Thunderbird Desktop Release channel will be the default download. If you’re not […]

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The Thunderbird Mobile team are crafting the newest chapter of the Thunderbird story. In this month’s office hours, we sat down to chat with the entire mobile team! This includes Philipp Kewisch, Sr. Manager of Mobile Engineering (and long-time Thunderbird contributor), and Sr. Software Engineers cketti and Wolf Montwé (long-time K-9 Mail maintainer and developer, […]

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Happy New Year Thunderbirders! With a productive December and a good rest now behind us, the team is ready for an amazing year. Since the last update, we’ve had some successes that have felt great. We also completed a retrospective on a major pain point from last year. This has been humbling and has provided […]

The post Thunderbird Monthly Development Digest – December 2024 appeared first on The Thunderbird Blog.