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Mozilla Thunderbird

Version 142.0  ·  Updated: May 29, 2026
Open Source WindowsmacOSLinux ★ 4.0 (778 ratings)

Open-source email client supporting IMAP, SMTP, POP3 protocols with tabbed interface and advanced filtering capabilities.

Jane Hoskyn
Jane Hoskyn
Senior Software Reviewer
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Mozilla Thunderbird — Key Facts

Latest Version
142.0
Platforms
Windows, macOS, Linux
Price
Free to download
User Rating
★ 4.0 / 5 (778 ratings)

Mozilla Thunderbird Screenshots

About Mozilla Thunderbird

The Thunderbird 142.0 download brings Mozilla's mature email client to your desktop with enhanced messaging capabilities. This open source application handles multiple email protocols including IMAP, SMTP, and POP3, making it suitable for both personal and business communication needs. The tabbed interface allows you to open multiple emails simultaneously, improving workflow efficiency when managing heavy correspondence volumes.

Setting up new accounts becomes straightforward with the improved account wizard that auto-detects server settings for major providers. Advanced message filtering lets you organise incoming mail automatically based on sender, subject, or content criteria. The redesigned extension manager provides better control over add-ons, while folder grouping helps maintain organised mailboxes. Enhanced privacy controls protect against tracking pixels commonly embedded in promotional emails.

Performance optimisations in this release deliver faster startup times compared to previous versions, though Thunderbird remains more resource-intensive than lightweight alternatives like Mailspring. The interface feels familiar to users migrating from internet communication applications, but newcomers might find the extensive customisation options initially overwhelming. TLS encryption ensures secure connections to mail servers, while built-in RSS feed support consolidates news reading alongside email management.

Thunderbird 142.0 suits users who prioritise feature depth over simplicity, particularly those managing multiple email accounts or requiring reliable filtering capabilities. The windows installation includes offline support, essential for accessing previously downloaded messages without internet connectivity. While commercial alternatives offer sleeker interfaces, this free solution provides enterprise-grade functionality without subscription costs, making it ideal for budget-conscious organisations seeking reliable email management tools.

Mozilla Thunderbird is a open source internet & communication available for Windows, macOS, Linux. Browse more open source software or email programs.

Frequently Asked Questions

Is Thunderbird 142.0 safe to download?
Yes, Thunderbird 142.0 is completely safe to download from Mozilla's official servers. The application undergoes rigorous security testing and uses TLS encryption to protect your email communications. Mozilla has maintained Thunderbird as open-source software since 2003, with transparent code auditing by the global developer community ensuring no malicious components exist.
Does Thunderbird 142.0 work on Windows 11?
Yes, Thunderbird 142.0 runs natively on Windows 11 with full compatibility. The installer automatically configures system integration including default mail handler registration and Start menu shortcuts. Version 142.0 includes specific optimisations for Windows 11's updated security framework and supports the operating system's notification system for incoming message alerts.
How do I uninstall Thunderbird 142.0 on Windows?
Open Windows Settings, manage to Apps & Features, locate Mozilla Thunderbird in the installed programs list, and click Uninstall. Alternatively, use the Programs and Features control panel for older Windows versions. The uninstaller removes the application files but preserves your email profiles and messages in the AppData folder unless you specifically choose to delete user data during removal.
Can Thunderbird 142.0 import emails from Outlook PST files?
Yes, Thunderbird 142.0 can import emails from Outlook PST files using the built-in Import Wizard. Access this feature through Tools > Import to migrate messages, contacts, and account settings from various email clients. The import process supports both ANSI and Unicode PST formats, though very large archives may require splitting into smaller segments for optimal performance.
Jane Hoskyn
Reviewed by Jane Hoskyn
Senior Software Reviewer · BigForkSteering
Senior software reviewer with two decades of hands-on testing across consumer Windows, macOS and Linux desktop tools. Specialises in free utilities, security software, productivity suites and the practical day-to-day programs households and small teams rely on. Reviews are built on real installations, real workloads and verified developer release notes — no rebundled binaries.
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Program Details
Version142.0
LicenseOpen Source
PlatformsWindows, macOS, Linux
UpdatedMay 29, 2026
CategoryInternet & Communication
User Rating
4.0
778 ratings
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