License: Open source
- Windows
- macOS
- Linux
- Android
Status: Active
- EML: opens and saves, full fidelity
- ICS: opens and saves, full fidelity. Import and export of calendar events and tasks
This replaces Microsoft 365 and Microsoft Outlook
Thunderbird
Free open-source email client with calendar, tasks and address book, for Windows, macOS, Linux and Android.
Facts
- Made by
- MZLA Technologies
- Website
- www.thunderbird.net
- License
- License: Open sourceMPL-2.0
- Pricing
- Free
- Platforms
- Windows
- macOS
- Linux
- Android
- Self-hostable
- No
- Works offline
- Yes
- Account required
- No
- Maturity
- Stable
- Source code
- github: thunderbird/thunderbird-desktop
- Maintenance
- Status: ActiveLast commit
Thunderbird is a free alternative to
Situational. Best for replacing only Outlook's email and calendar.
2 people switched
Top pick. Best for a free open-source mail client on any desktop.
0 people switched
Health history
Repository checks, newest first; last checked Oct 8, 2026. Checks older than 90 days are kept as one per week.
| Checked | Last commit | Latest release | Stars | State |
|---|---|---|---|---|
| None | 183 | Open |
Changelog
License, pricing and status changes for this tool.
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Reviews
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