Mozilla Thunderbird

Last updated: September 15, 2026

Version Latest License Open Source OS Windows

Direct download from the publisher’s own server — no repacks, no bundled installers. By Mozilla. Report a broken link

Mozilla Thunderbird — Thunderbird is a free, open-source email client with calendar, contacts, chat and powerful filtering in one app.

Thunderbird is a free, full-featured email client from the makers of Firefox. It handles multiple accounts, calendars, tasks, contacts, newsgroups and RSS feeds, with strong junk filtering and OpenPGP encryption built in.

Key features:

Unified inbox for all your mail accounts (IMAP/POP3/Exchange via add-on)
Built-in calendar, tasks and contacts
End-to-end encryption with OpenPGP
Adaptive junk mail filtering
Tabbed email, quick filter bar and powerful search
Extensible with themes and add-ons

Frequently asked questions

Is Thunderbird free?

Yes, free and open source, now developed by the Mozilla-owned MZLA with major annual releases.

Does it work with Gmail and Outlook.com?

Yes, both set up automatically with OAuth. Exchange support arrived natively in recent versions.

Can it handle multiple accounts?

Yes, unlimited accounts with a unified inbox, per-account identities and filters.

Similar software

Feedreader 3.11 Beta 2 Feedreader is a lightweight open-source aggregator that supports RSS and ATOM formats Freeware4.54 MB Living Cookbook 2005 1.5 Cooking and recipe management software with nutritional analysis and much more Shareware16.65 MB FlaX 4.10 FlaX creates text effects for Macromedia Flash, and does that real-time Shareware756 KB IncrediMail to EML Converter 1.0 IncrediMail to EML Converter will export your IncrediMail message-stores to plain .eml-... Freeware265 KB Show.kit 2.11 Show.kit - A treat for everybody who needs to create a website in lightning speed Demo5.41 MB qBittorrent qBittorrent is the best free, ad-free, open-source BitTorrent client with built-in sear... Open Source