Thunderbird: free email client with calendar and contacts

Thunderbird is a free email client from the Mozilla family. It manages messages, calendars and contacts in one app, shows no ads and is funded by donations. Thunderbird is available for Windows, macOS and Linux as well as for Android.

Install

1. Open thunderbird.net and choose Download.
2. Run the file and follow the wizard.

Set up a mailbox

1. On the first start, Thunderbird asks for your name, email address and password.
2. For most providers, Thunderbird finds the server settings automatically.
3. Confirm with Done.

When Outlook fits better

If your company works with Exchange or Microsoft 365 and shared calendars, Outlook is often the simpler choice. Outlook is included in Office Home & Business.

Sources

Checked on 2026-11-09 against the publisher’s information:

• www.thunderbird.net/en-US/