ThunderbirdThunderbird
Thunderbird

Thunderbird

Free and open-source email client for managing email, calendars, and contacts.

Reddit“Tuta Mail & Tuta Calendar are now available as add-ons in Thunderbird. Find out how to add Tuta as an add-on �…”
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About

Thunderbird offers a powerful, free, and open-source email, calendar, and contacts app for desktop (Windows, Linux, macOS) and mobile (Android). It aims to free users from inbox chaos and manipulation by providing a private, secure, and customizable productivity tool funded by user donations. Thunderbird serves individuals and businesses seeking to manage their communications and schedules efficiently.

Technology stack

detected 2026-06-23
Est. monthly stack spend~$360/mo
CDN
Cloudflare
EmailGoogle Workspace
Comments
(6)
1 positive2 mixed3 negative
Reddit
r/Thunderbirdu/umitseyhanJun 6, 2026Mixed

“What are the differences between Thunderbird and K-9 Mail nowadays?”

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Reddit
r/Thunderbirdu/DifficultDerekMay 25, 2026Negative

“Hiya, i've been trying to replace my webmail with Thunderbird for a few days now and unfortunately i have some negative feedback :( I'm a Linux user, using 151 via Flatpak. The stuff i'm not liking: No minimise to tray. This is surprising f…”

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Reddit
r/Thunderbirdu/afsrjMar 20, 2026Negative

“Although I always use Thunderbird again, I end up returning to emClient in less than a day. Reflection: Thunderbird seems to have stopped in time about 10 years ago. I am a financial donor and I trust the project, but I feel that it is not…”

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Reddit
r/tutanotau/TutanotaFeb 18, 2026Positive💎

“Tuta Mail & Tuta Calendar are now available as add-ons in Thunderbird. Find out how to add Tuta as an add-on 👉 https://tuta.com/blog/tuta-add-on-in-thunderbird Enjoy! ❤️”

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Reddit
r/Thunderbirdu/UnclearMango5534Feb 10, 2026Mixed

“Is thunderbird still safe in 2026?. Is their privacy, data collection etc… still good at this time?”

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Reddit
r/Thunderbirdu/tashafanOct 27, 2025Negative

“I missed a very important meeting last week because Thunderbird had silently disabled my calendar. This could be due to this , or any other related ticket . In some cases Thunderbird will decide to disable your calendar, and you are not not…”

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Frequently asked

What does Thunderbird do?

Thunderbird offers a powerful, free, and open-source email, calendar, and contacts app for desktop (Windows, Linux, macOS) and mobile (Android). It aims to free users from inbox chaos and manipulation by providing a private, secure, and customizable productivity tool funded by user donations. Thunderbird serves individuals and businesses seeking to manage their communications and schedules efficiently.

When was Thunderbird founded?

Thunderbird was founded in 2003.

What industry does Thunderbird operate in?

Thunderbird operates in Email Client, Open Source, Productivity Software, Personal Information Manager, Cross-Platform, Personal Information Management.

How many employees does Thunderbird have?

Thunderbird has approximately 48 people on record.