Thunderbird
Office & PDFOpen-source email client from Mozilla, the makers of Firefox. Handles multiple mailboxes, calendar, contacts, spam filtering and email encryption.
Open sourceEasy to use
Free alternative to
Code activity
Source code is not hosted on GitHub.
Details
- Type
- Open source
- License
- MPL-2.0
- Platforms
- Windows · Mac · Linux · Android
- Ease of use
- Easy to use

Pros
- Combines Gmail, Outlook and custom-domain accounts in one place
- Built-in calendar and contacts
- Available in many languages
Cons
- Connecting to a corporate Exchange server needs an add-on
Use Thunderbird instead of
OutlookHandles multiple accounts, calendars, contacts and spam filtering, covering what most people use Outlook for.
FAQ
Is Thunderbird free?
Yes. Thunderbird is open source (MPL-2.0 license) and free for personal and commercial use.
Which platforms does Thunderbird run on?
Thunderbird is available for Windows, Mac, Linux and Android.
What can I use Thunderbird instead of?
Thunderbird is a free alternative to Outlook.
Similar apps
No apps match. Try removing a filter.