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Editors' Review · September 16, 2025

Mozilla Thunderbird ESR: A Versatile Email Client

Mozilla Thunderbird ESR is a free, open-source email, newsfeed, chat, and calendaring client designed for Windows users. This program emphasizes the importance of open standards, allowing seamless communication across different platforms. With an easy setup process and extensive customization options, users can tailor the client to fit their specific needs. The ESR (Extended Support Release) version focuses on providing new features annually while ensuring stability and security updates are delivered monthly. This utility caters to those who prioritize both functionality and security in their email experience. Users can enjoy a reliable and feature-rich platform that supports various communication methods. The Thunderbird ESR version is particularly suitable for individuals and organizations seeking a dependable tool for managing their electronic communications without the constraints of proprietary systems.

Technical

Title
Mozilla Thunderbird ESR sl 140.2.1 for Windows
Requirements
Windows 11
License
Free
Latest update
Author
Mozilla Foundation
SHA-1
89b655cfb31225547f111f1b6717ef9de7c0be9d
Filename
140.2.1.exe

Program available in other languages



Changelog

We don’t have any change log information yet for version 140.2.1 of Mozilla Thunderbird ESR sl. Sometimes publishers take a little while to make this information available, so please check back in a few days to see if it has been updated.

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