Thunderbird is a free and open source email, newsfeed, chat, and calendaring client, that’s easy to set up and customise. One of the core principles of Thunderbird is the use and promotion of open standards - this focus is a rejection of our world of closed platforms and services that can’t communicate with each other. We want our users to have freedom and choice in how they communicate.
Publisher’s description
What is Mozilla Thunderbird (MSIX)?
Mozilla Thunderbird (MSIX) by Mozilla is open-source Windows software in the chat & messaging category.
Installation and requirements
The publisher provides MSIX installers for 64-bit and 32-bit Windows. It needs Windows 10 1809 or newer. A silent install is possible with the installer’s documented switches.
Updates and version history
The current version is 158.0.1, released on October 20, 2026. The version history goes back to March 4, 2025: 50 releases, all linked to the official files. That is about 31 releases a year. The last update is less than a month old.
Popularity and file types
On Windows it registers 3 file types, including .eml, .ics and .wdseml. Similar programs include Signal, Discord and Telegram Desktop.
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Documented silent install
- Frequent updates (about 31 a year)
Cons
- No native ARM64 build
In short: Mozilla Thunderbird (MSIX) is an open-source chat & messaging tool for 64-bit and 32-bit PCs. It is actively maintained. Administrators can deploy it unattended.
Is Mozilla Thunderbird (MSIX) safe to download?
- The file is served by download-installer.cdn.mozilla.net; check that it is the publisher’s official mirror
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
AE2376DAAD57C6C6E5944599D3FCF18D5923B039357D2ED2077F4960327DCF0D· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 50 versions ›50 versions over 2 years · about 31 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 158.0.1Latest | October 20, 2026 | — | 32-bit MSIX64-bit MSIX |
| 158.0 | October 13, 2026 | — | 64-bit MSIX32-bit MSIX |
| 157.0.1 | October 1, 2026 | — | 64-bit MSIX32-bit MSIX |
| 157.0 | September 30, 2026 | — | 64-bit MSIX32-bit MSIX |
| 156.0.1 | September 22, 2026 | — | 32-bit MSIX64-bit MSIX |
| 156.0 | September 15, 2026 | — | 64-bit MSIX32-bit MSIX |
| 155.0.1 | September 9, 2026 | — | 64-bit MSIX32-bit MSIX |
| 155.0 | September 1, 2026 | — | 64-bit MSIX32-bit MSIX |
Install from the command line
Silent install ›winget install --id Mozilla.Thunderbird.MSIX -eAdd-AppxPackage -Path "Thunderbird Setup 158.0.1.msix"Get-AppxPackage -Name MozillaThunderbird.MozillaThunderbird | Remove-AppxPackageRelated guide: How to use winget: install and update apps
Also for other systems
brew install --cask thunderbirdInformation
- Publisher
- Mozilla
- Category
- Chat & messaging
- Licence
- MPL-2.0
- Price
- Free
- Requires
- Windows 11 / 10 (Windows 10 1809+)
- Architecture
- 64-bit, 32-bit
- Installer
- MSIX
- Version
- 158.0.1
- Released
- October 20, 2026
- Added to the catalogue
- March 7, 2025
- Versions listed
- 50
- Updates / year
- 30.7
- Website
- thunderbird.net
- winget ID
- Mozilla.Thunderbird.MSIX
File types it opens (3)
Ratings and reviews
No reviews yet. Be the first to rate it.
Alternatives to Mozilla Thunderbird (MSIX)
See all ›-
Open source3.4M ↓ -
Proprietary882.4K ↓ -
Telegram Desktop7.3.3A cloud-based mobile and desktop messaging app with a focus on security and speed.Open source1M ↓ -
Proprietary9.8M ↓ -
Rocket.Chat4.18.5Rocket.Chat is the leading open source team chat software solution. Free, unlimited and completely customizable with on-premises and SaaS cloud hosting.Open source973K ↓ -
Proprietary259.3K ↓ -
Pidgin2.14.14Pidgin is a universal chat client, allowing you to consolidate all your different messaging apps into a single tool.Open source175.4K ↓ -
Open source97.4K ↓
Frequently asked questions
Is Mozilla Thunderbird (MSIX) free?
Yes. Mozilla Thunderbird (MSIX) is open-source software under the MPL-2.0 licence.
Is Mozilla Thunderbird (MSIX) safe to download?
The download comes from download-installer.cdn.mozilla.net; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install Mozilla Thunderbird (MSIX) with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Can Mozilla Thunderbird (MSIX) be installed silently?
Yes. The silent install page lists the exact command for each installer.
Which Windows versions does Mozilla Thunderbird (MSIX) support?
The installer requires Windows 10 1809 or newer and is available for 64-bit and 32-bit.
Does Mozilla Thunderbird (MSIX) run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit and 32-bit version through emulation.
Where can I download an older version of Mozilla Thunderbird (MSIX)?
The versions page lists all 50 versions with links to their official installer files, back to March 4, 2025.
What are alternatives to Mozilla Thunderbird (MSIX)?
Signal, Discord, Telegram Desktop, Slack and Rocket.Chat. The alternatives page compares them.
