Thunderbird is the leading free and open-source email, calendaring, newsfeed, and chat client with more than 20 million active monthly users across Windows, macOS, and Linux. One of Thunderbird's core principles is the use and promotion of open and decentralized standards. Thunderbird is part of MZLA Technologies Corporation, a wholly-owned subsidiary of the Mozilla Foundation.
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Thunderbird's 2026 plans: Database overhaul and iOS app
Thunderbird 145 adds native Exchange support
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Columns5| Company | Markets | New markets | Momentum | Activity | Expansion score |
|---|---|---|---|---|---|
 Thunderbird ProjectYou | 0 | 0 | 0% | 0 | 11 |
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Mozilla released updates for Thunderbird to fix a security flaw in HTML email display that could reveal login data.
Thunderbird is a free, open-source email client offering speed, privacy, and customization. It supports multiple accounts, various protocols, and features like tabbed email and web search.
Guide on how to sort emails in Thunderbird by arrival order across all inboxes without grouping, avoiding individual folder configuration.
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