The Thunderbird team is off to rest and recharge, and come back strong on January 5! Until then: If you need community support: support.mozilla.org If you need to report a bug: bugzilla.mozilla.org If you want to suggest a feature: connect.mozilla.org See you all next year! #Thunderbird

We can't put enough gratitude in the character limit for everything our community has helped us do this year, so we wrote a recap blog. Thank you everyone who made this all happen! 💙 🙌 #Thunderbird #OpenSource blog.thunderbird.net/2025/12/thund…

It's the last Development Digest for 2025! We're celebrating our Exchange success (but not resting on our labors), sharing our Calendar UI milestones, and grateful for a community contribution to fix a 19-year-old bug! #Thunderbird #OpenSource blog.thunderbird.net/2025/12/thund…

Exchange email support has landed! We've invited members of our desktop team to Community Office Hours to give us all the details about what's in now and what's coming next! #Thunderbird #Exchange blog.thunderbird.net/2025/12/video…

We are building tech you can trust. Thank you to @ostifofficial.bsky.social and 7A Security for their collaboration on the security audit for Thunderbird Send, our end-to-end encrypted file transfer service (coming to everyone soon, open source now). blog.thunderbird.net/2025/12/thun...

Recently we completed a security audit of Thunderbird Send, our upcoming end-to-end encrypted large file sharing service, with the help of the @@ostifofficial.bsky.social and 7ASecurity. Learn how we're making Send worthy of your trust. #Thunderbird #OpenSource blog.thunderbird.net/2025/12/thund…

We're grateful for Giving Tuesday, a day to support the organizations and projects you care about! #Thunderbird #GivingTuesday

Fixing old Android code, integrating with the upcoming Thunderbird Pro, and making a balanced iOS roadmap are all part of our mobile development goals in 2026. #Thunderbird #OpenSource https://blog.thunderbird.net/2025/12/state-of-the-thunder-14-the-2026-mobile-roadmap/

Thunderbird Pro is getting closer to its Early Bird release! Find out what that means and what it includes in our latest update. #Thunderbird #ThunderbirdPro #Thundermail #OpenSource https://blog.thunderbird.net/2025/11/thunderbird-pro-november-2025-update/

Exchange/Microsoft365 account support built into Thunderbird now! Thunderbird users have asked us for this for years and now it is here. Enjoy. For nerds: the architecture built for this opens the door for JMAP support. blog.thunderbird.net/2025/11/thun...

If your school or workplace uses Exchange for email, accessing it with Thunderbird just got easier! Our blog post has all the details on getting connected and future features. #Thunderbird #Exchange https://blog.thunderbird.net/2025/11/thunderbird-adds-native-microsoft-exchange-email-support/

It seems like yesterday we released Thunderbird for Android. See how fast our first mobile app is growing up. #Thunderbird #OpenSource #Android https://blog.thunderbird.net/2025/11/video-an-android-retrospective/

At Mozilla we make tech that puts people before profit. We make tech that is designed to help people live better lives. We make tech that is GOOD.

Getting closer to releasing Thundermail, Thunderbird Appointment and Thunderbird Send to the world. Built on open source and open standards - we're working to make a suite of tools that help people break their reliance on big tech (think Microsoft O365 and Gmail). Looking forward to sharing more.

Thunderbird 144 is out now! Exchange support is closer to officially landing, dragging and dropping your folders is easier, and we're adding new ways to keep your email safe! #Thunderbird #OpenSource #Email https://blog.thunderbird.net/2025/10/thunderbird-monthly-release-144-recap/

Not all of our progress is headline worthy! But steady, detail-oriented work, described in our latest development update, is a firm foundation for the next leaps forward. #Thunderbird #Email #OpenSource https://blog.thunderbird.net/2025/10/thunderbird-monthly-development-digest-september-2025/

What's the topic of Office Hours conversation? Conversation view! From backend changes to in-person collaboration, find out how the Thunderbird team is making it possible: #Thunderbird #OpenSource https://blog.thunderbird.net/2025/10/video-conversation-view/

In this month's Dev Digest, we're: * describing the final QA steps as Exchange mail support lands in 144 * discussing future Exchange work * adding Exchange to Account Hub * recapping the Conversation View workweek * and more! #Thunderbird #OpenSource blog.thunderbird.net/2025/09/thun...

In-person and virtual community initiatives, adjusting the Android roadmap, and the journey to true Conversation View (and why it's hard!). All this and more, including a gassy Boston Terrier as a bonus. Read/watch/listen at the blog: #Thunderbird #OpenSource blog.thunderbird.net/2025/09/stat...

There's a lot going on in @firefox.com and Thunderbird this week! First, we're taking part in Mozilla Support's Ask-A Fox event! (community.mozilla.org/en/campaigns...) Get involved, have fun, and help fellow Thunderbird users on desktop and Android! (1/2) #Firefox #Thunderbird #AskAFox

We've got updates on our Android and upcoming iOS apps! Take a peek at the new Android account drawer, iOS account setup and upcoming monthly release schedule and learn why recent updates affected readability and how we're fixing it. #Thunderbird #OpenSource blog.thunderbird.net/2025/09/mobi...

After a short hiatus, State of the Thunder is back! In addition to tackling community questions, we're also responding to the top 20-ish requested features from Mozilla Connect. Get the latest news on Sync, translations, and more! #Thunderbird #OpenSource blog.thunderbird.net/2025/09/stat...

Back-to-school seasoning may be winding down, but Thunderbird is seeing where we make the grade (and don’t) with accessibility. Learn about our recent a11y study and how to help us make Thunderbird accessible to everyone! #Thunderbird #Accessibility #OpenSource blog.thunderbird.net/2025/09/vide...

Thunderbird 142.0 has a host of exciting features and bug fixes. From improving the PDF experience to better support for quiet time, learn what's just landed in our recap of the newest monthly release. #Thunderbird #OpenSource #Email blog.thunderbird.net/2025/08/thun...

We’ll be at the @austinjavascript.com Meetup tonight! 🎉 Come say hi, chat about open source, and connect with the community! #Thunderbird #JavaScript #Austin www.meetup.com/austin-js/ev...

Curious about our progress on Thunderbird Pro? Our latest update, direct from Managing Director Ryan Sipes, keeps you in the know - and lets you know how to stay updated: #Thunderbird #ThunderbirdPro #OpenSource blog.thunderbird.net/2025/08/tbpr...

Our regular Development Digest has some exciting updates on features that are nearing completion (Exchange email support) and are just starting development (Conversation View)! We're also tackling the usual maintenance tasks and bugs! #Thunderbird #OpenSource blog.thunderbird.net/2025/08/thun...

For this month's Office Hours, we're talking to members of our Design Team about how we're assessing and improving Accessibility in Thunderbird. Have a question you'd like us to ask? Put it in the comments below and we'll do our best to answer them all in the video/blog #Thunderbird #Accessibility

Getting Things Done + labels + keyboard shortcuts = 💙 and an organized inbox. Find out how to get started in our latest Maximize Your Day blog post! #Thunderbird #Productivity #Email blog.thunderbird.net/2025/08/maxi...

Archiving from notifications, warnings about expiring PGP keys, bug fixes, and more! Find out what's in Thunderbird 141.0 (and how you can get it) in our new Monthly Release Recap! #Thunderbird #OpenSource #Email blog.thunderbird.net/2025/08/mont...

All of the latest discussions about our development in our ongoing State of the Thunder series, now in an easy to read format, thanks to your feedback. (With links to the videos and podcasts for those who still want to watch or listen!) #Thunderbird #OpenSource blog.thunderbird.net/2025/07/stat...

Thunderbird has been so lucky to have a community that's helped us survive and now thrive, and we're building a team that can help our community thrive. Meet the members of the team and learn what they have planned! blog.thunderbird.net/2025/07/welc... #Thunderbird #Community #OpenSource

Our new "Contributing to Thunderbird" videos break down the barriers to developing, testing, translating, and supporting Thunderbird on desktop and mobile. Learn how to set up a development environment on your Mac... #Thunderbird #OpenSource tilvids.com/w/qPFUDAC9DV...

Our Community Office Hours is back! This month we're exploring our latest Extended Support Release, Thunderbird 140.0 ESR "Eclipse" with new features, what didn't make the cut, and why you should give our new Monthly Release a try. #Thunderbird #OpenSource blog.thunderbird.net/2025/07/vide...

We're gathering ideas on how to strengthen and improve the Thunderbird community. Whether you're a long-time contributor or a curious newbie, we would love to hear your thoughts! Share your suggestions below and help shape our community's future! #Thunderbird connect.mozilla.org/t5/discussio...

The latest Thunderbird mobile update is out! We're getting closer to sharable iOS screenshots while sharing a sneak peak at the new Android account drawer and folders. And check out all the improvements from our team and community! #Thunderbird #OpenSource blog.thunderbird.net/2025/07/mobi...

In the latest State of the Thunder, we're introducing @michaelellis.bsky.social, our new head of Community Programs, and answering questions about the upcoming Thunderbird Pro suite! Watch the video (or read the included summary) to learn more. #Thunderbird #OpenSource tilvids.com/w/c5iD1yzaPX...

Our latest Thunderbird Monthly Development Digest is out! We have news about: * The latest ESR, 140.0 "Eclipse" * Details about new Exchange Support features * Updates on Account Hub and the Global Message Database * Features and Fixes #Thunderbird #OpenSource blog.thunderbird.net/2025/07/thun...

Thunderbird 140 “Eclipse” is here! Our latest yearly Extended Support Release (ESR) brings improved visuals, including dark message mode and more powerful Appearance settings, native OS notifications and more to bring your inbox out of the shadows. #Thunderbird blog.thunderbird.net/2025/07/welc...

The latest volume of State of the Thunder is out! We're keeping you updated on our roadmap progress as we look towards Q3, sharing our advice on using Thunderbird developer tools, and giving you a deeper look into our fundraising model. #Thunderbird #OpenSource tilvids.com/w/huV2VHBZzq...

If you're heading to Droidcon in NYC this week, so are we! Two members from our Mobile team will be there, so if you see 'Thunderbird' on a name badge, say hi! We're looking forward to learning, making connections, and sharing our progress in the Android email space! #dcnyc25 #Thunderbird #Android

Our May Mobile Progress Report shows how we're: *getting ready for JMAP in iOS * planing early for TestFlight * coordinating localization for both apps * asking for feedback with the Android beta * improving the account drawer and more #Thunderbird #Email blog.thunderbird.net/2025/06/thun...

Thunderbird 140 is due next week! State of the Thunder dives the difference between yearly ESR, monthly Release, and our testing channels, Beta and Daily, how to know which one you're on, and how to switch. We also highlight the features coming to 140! #Thunderbird tilvids.com/w/uXEAMvdJEv...

Our latest Thunderbird + Rust Office Hours video is up! In it, @brendan.abolivier.bzh explores how Rust (along with a little C++) is powering our push to provide support for Microsoft Exchange. Learn more and find how to get involved! #Thunderbird #Rust #OpenSource tilvids.com/w/rqeETZqqEH...

You brought your questions to our team, and in the latest State of the Thunder, we're bringing the answers! This discussion covers a wide range of topics, from the new monthly Release channel to accessibility to UI. tilvids.com/w/unM4EeLbHH...

Want to know more about Thunderbird Pro, including Thundermail? Our latest Community Office Hours has you covered! We're discussing planned features, answering questions, and getting to know our new productivity suite before it hatches! #Thunderbird #OpenSource blog.thunderbird.net/2025/06/vide...

Have access to a Microsoft-hosted Exchange account? Exchange support is available in Thunderbird Daily for testing, and we could use your help making sure it's ready for users in a few months. See the Developers' mailing list to learn how to help: #Thunderbird #Exchange thunderbird.topicbox...

This State of the Thunder is about priorities. How do we set them, line them up with user needs, and adjust as needed? Also, updates on Thunderbird Sync, Thundermail and the Pro suite, and mobile development. Watch the entire discussion on TILvids: #Thunderbird #OpenSource tilvids.com/w/sT7C8G...

Curious about MZLA, how it relates to Thunderbird and how it works with (but differs from) Mozilla and the Mozilla Corporation? Want to know more about future plans, including Thundermail, and Thunderbird Pro? Watch the newest Community Office Hours with Director Ryan Sipes. blog.thunderbird.net...

Heading to #KotlinConf later this week? So are two members of our mobile team! Be sure to say hi if you see them in talks and in the hallway track, and we've even been told @kewisch.says.wtf is bringing some Thunderbird for Android stickers to share! #Thunderbird #Kotlin