Thunderbird
FreeA free, open source email client from Mozilla with unified inbox, calendar and add-on support.
About Thunderbird
Thunderbird is a free email application that gathers multiple accounts in one window, with a unified inbox, calendar, contacts and chat support. It supports IMAP, POP and Exchange-style protocols, and offers message filters, tabs, search, and add-ons to extend it.
It is developed by the Thunderbird project under MZLA Technologies, a Mozilla subsidiary, and released under the MPL 2.0. The desktop version covers Windows, macOS and Linux, and an Android app, based on K-9 Mail, is also listed. Google Play lists more than a million downloads. There is no charge, and the project is funded largely by user donations.
It suits people who prefer a local client to webmail, anyone managing several mailboxes, and users who want privacy-friendly software they can configure. It has a steeper learning curve than simple webmail, and no account with the developer is needed, only your own email accounts. The Windows build is released frequently, so keep it updated for security fixes.
Keep it updated since it handles untrusted email content. Winget lists Mozilla as publisher while the developer is MZLA Technologies.
Version history
1 release tracked- Windows: Fixes a crash with EWS and Graph messages handling relative URL fragments
Frequently asked
Is Thunderbird free?
Yes. It is free and funded mainly by donations.
Does it need an account?
No account with Thunderbird is needed, only your existing email accounts.
Which platforms does it run on?
Windows, macOS, Linux and Android.
Where does the download link go?
Directly to thunderbird.net or the official app store for your platform. PlanetSofts never rehosts installers or adds wrappers, and these links were last verified Oct 6, 2026.