Reliable Email Client with Extended Support

Mozilla Thunderbird ESR is a free, open-source email client that prioritizes stability and security while introducing new features. It is designed for users who appreciate a dependable email experience, offering annual updates and monthly fixes. The application allows for easy setup and customization of email accounts, chat functionalities, and calendar integrations, making it a versatile communication tool suitable for various user needs.

Top Recommended Alternative

Emphasizing open standards, Thunderbird ESR ensures users maintain control over their communications. It provides robust management of emails, newsfeeds, and chats, making it an efficient platform for both personal and professional use. With its focus on user choice and freedom, Thunderbird ESR stands out as a reliable option for anyone in need of a comprehensive email client.

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Is Mozilla Thunderbird ESR is safe?

100/100

Score result: Clean

This file passed a comprehensive security scan using VirusTotal technology. It is safe to download.

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Scan Info

Last scan
Wednesday, January 7, 2026
Scan provider
VirusTotal · Full report

File Integrity

File
140.6.0.exe
SHA256
949170714a7fb1627e7fca22089a19b573e0e3db1452de7fcb73731a8648f3df
SHA1
acbb43f5aa374513d27006dbd2046a7088adb811

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Mozilla Thunderbird ESR is has been thoroughly scanned by our advanced security systems and verified by industry-leading partners. This file comes from the official developer and has passed all our security checks, showing no signs of viruses, malware, or spyware. For more information, visit our Security and Trust Center