Thunderbird is a free and open source email, newsfeed, chat, and calendaring client, that’s easy to set up and customize. 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.
This is the official annual extended support release. Thie release is intended for users who want all available new features on an annual basis and stability/security fixes on a monthly basis.
Publisher’s description
What is Mozilla Thunderbird ESR?
Mozilla Thunderbird ESR is an open-source email client program for Windows from Mozilla. It ranks 37th by popularity among email clients in this catalogue.
Installation and requirements
Official installers exist for 64-bit and 32-bit as EXE (NSIS). Installation asks for administrator rights. The installer supports unattended (silent) installation.
Updates and version history
The current version is 153.6.0, released on October 27, 2026. 70 versions are listed since August 6, 2024, each with links to its own installer 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 Proton Mail Bridge, Tuta Mail and Pebble.
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
- Installation needs administrator rights
In short: Mozilla Thunderbird ESR is an open-source email client tool for 64-bit and 32-bit PCs. It is actively maintained. Administrators can deploy it unattended.
Is Mozilla Thunderbird ESR 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:
76EF8CFD592B9EE8461FAE321794250B49AD5F3290337486AA29C1B3A3304D4E· 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 70 versions ›70 versions over 2 years · about 31 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 153.6.0Latest | October 27, 2026 | — | 32-bit EXE (NSIS)64-bit EXE (NSIS) |
| 153.5.1 | October 20, 2026 | — | 32-bit EXE (NSIS)64-bit EXE (NSIS) |
| 153.5.0 | October 13, 2026 | — | 64-bit EXE (NSIS)32-bit EXE (NSIS) |
| 153.4.0 | September 30, 2026 | — | 64-bit EXE (NSIS)32-bit EXE (NSIS) |
| 153.3.1 | September 18, 2026 | — | 32-bit EXE (NSIS)64-bit EXE (NSIS) |
| 153.3.0 | September 16, 2026 | — | 32-bit EXE (NSIS)64-bit EXE (NSIS) |
| 153.2.0 | September 1, 2026 | — | 64-bit EXE (NSIS)32-bit EXE (NSIS) |
| 153.1.1 | August 26, 2026 | — | 64-bit EXE (NSIS)32-bit EXE (NSIS) |
Install from the command line
Silent install ›winget install --id Mozilla.Thunderbird.ESR -e"Thunderbird Setup 153.6.0esr.exe" /S /PreventRebootRequired=trueRelated guide: How to use winget: install and update apps
Also for other systems
brew install --cask thunderbird@esrInformation
- Publisher
- Mozilla
- Category
- Email clients
- Licence
- MPL-2.0
- Price
- Free
- Requires
- Windows 11 / 10
- Architecture
- 64-bit, 32-bit
- Installer
- EXE (NSIS)
- Version
- 153.6.0
- Released
- October 27, 2026
- Added to the catalogue
- March 17, 2025
- Versions listed
- 70
- Updates / year
- 31.5
- Downloads on ExeAtlas
- 2
- Website
- thunderbird.net
- winget ID
- Mozilla.Thunderbird.ESR
File types it opens (3)
Ratings and reviews
No reviews yet. Be the first to rate it.
Alternatives to Mozilla Thunderbird ESR
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Frequently asked questions
Is Mozilla Thunderbird ESR free?
Yes. Mozilla Thunderbird ESR is open-source software under the MPL-2.0 licence.
Is Mozilla Thunderbird ESR 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 ESR 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 ESR be installed silently?
Yes. The silent install page lists the exact command for each installer.
Does Mozilla Thunderbird ESR 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 ESR?
The versions page lists all 70 versions with links to their official installer files, back to August 6, 2024.
What are alternatives to Mozilla Thunderbird ESR?
Proton Mail Bridge, Tuta Mail, Pebble, Mailspring and Mailbird. The alternatives page compares them.
