# Thunderbird

A free, open-source email client with unified inbox, calendar, and encryption.

HTML: https://softbests.com/software/thunderbird
Markdown: https://softbests.com/software/thunderbird.md
Website: https://www.thunderbird.net

- Category: [Productivity](https://softbests.com/category/productivity)
- Pricing: Free
- Platforms: macOS, Windows, Linux, Android

## Best for

People who want their email, calendar, and contacts in a desktop app they control, without a subscription.

## Why it deserves attention

Thunderbird handles IMAP and POP accounts, unified folders, fast search, a calendar, contacts, and OpenPGP encryption, and it extends through add-ons. It is MPL-2.0 licensed and free, with builds for Windows, macOS, Linux, and Android. Mozilla is also building Thundermail, a privacy-focused mail service that will work with the client. The trade-off is a traditional interface that some find dense, plus local indexing and storage that grow with very large mailboxes.

## Can replace

- Outlook

## Related and alternatives

- [FiloMail](https://softbests.com/software/filomail)
- [Cal.com](https://softbests.com/software/cal-com)