Mozilla Thunderbird ESR is a free email application for Windows, Linux, and Mac operating systems. It is easy to customize and has many useful features. A portable version is also available.

Mozilla Thunderbird ESR is an email client prioritizing safety, speed, and user-friendliness. It has numerous built-in features, such as easy message search, customizable views, and IMAP/POP and RSS support.

This release channel of Mozilla Thunderbird ESR features a single dynamic toolbar, presenting frequently used and contextual options based on the tab or Space that is currently active. Take complete control by customizing the toolbar and window layout to fit your workflow perfectly. It also has a complete redesign of its GUI making it even easier to navigate and more appealing to the eye.

Nebula ESR Versus Eclipse ESR

128+ Nebula ESR: This version is part of the ESR 128 cycle, which started in July 2024 and will likely finish around September 2025.

140+ Eclipse ESR: This is the latest ESR release, which began in June 2025. It will be supported for about one year.

Mozilla Thunderbird ESR offers a wide range of Mozilla Add-Ons that allow users to incorporate almost unlimited additional features. These add-ons are essential for building a personalized email client that caters to your requirements.

Mozilla Thunderbird ESR remains a reliable and safe option for managing your organization's emails. This email client includes several safety features that will benefit you, such as its junk mail filter. This feature efficiently analyzes all incoming mail and detects any that is likely to be spam. Additionally, you can manually select any emails that may slip through the filter. Thunderbird also uses high-level security measures, including digital signing, message encryption, S/MIME support, certificate support, and security devices, which enterprises and government agencies commonly use.

Similar:
Mozilla Thunderbird Has Both Junk and Spam Folders