Thunderbird Beta

By Mozilla MPL-2.0

Windows

macOS

Linux

A free open-repo email, calendar & chat app

Stable Features

End-to-end encryption: End-to-end encryption, including media and calls if supported
Spaces: Browse, join and manage Matrix spaces
VoIP (1:1): 1-to-1 voice/video calls
Threads: Read, start and participate in threads
Legacy SSO: Log in with Single Sign-On using the legacy API
VoIP (Jitsi): Jitsi-based group calls
Multi-Account: Log into multiple accounts at the same time using a single client instance
Multi-Language: Client user interface supports multiple languages
OAuth 2.0: Log in using the new API based on the OAuth 2.0/OIDC standard
Invisible Cryptography: Simplified client user experience and improved security by enforcing device verification per MSC4153

Experimental Features

VoIP (MatrixRTC): Matrix-native voice/video calls based on MSC4143 MatrixRTC
Simplified Sliding Sync: Swift and efficient connection to the server using the next generation API from MSC4186