Mozilla Thunderbird

Mozilla Thunderbird
	Logo used since 2023
	Mozilla Thunderbird 115 showing the mail inbox
Developer(s)	Mozilla Foundation (formerly Mozilla Messaging); MZLA Technologies Corporation;
Initial release	July 28, 2003
Stable release	115.11.0 / 14 May 2024
Preview release	127.0beta (15 May 2024) [±]
Repository	hg.mozilla.org/comm-central ;
Written in	C, C++, JavaScript, CSS, Rust, XUL, XBL
Engines	Gecko, SpiderMonkey
Operating system	Windows 7 or later; macOS 10.12 or later; FreeBSD; Linux
Size	50 MB
Available in	65 languages
	List of languages Albanian, Arabic, Armenian, Asturian, Basque, Belarusian, Breton, Bulgarian, Catalan, Chinese (Simplified), Chinese (Traditional), Croatian, Czech, Danish, Dutch, English (British), English (US), Estonian, Finnish, French, Frisian, Gaelic (Scotland), Galician, German, Greek, Hebrew, Hungarian, Icelandic, Indonesian, Irish, Italian, Japanese, Kabyle, Korean, Lithuanian, Lower Sorbian, Norwegian (Bokmål), Norwegian (Nynorsk), Polish, Portuguese (Brazilian), Portuguese (Portugal), Romanian, Romansh, Russian, Serbian, Sinhala, Slovak, Slovenian, Spanish (Argentina), Spanish (Spain), Swedish, Turkish, Ukrainian, Upper Sorbian, Vietnamese, Welsh.
Type	Email client, personal information manager, instant messaging client, news client, feed reader
License	MPL-2.0
Website	www.thunderbird.net

Mozilla Thunderbird is free and open-source^[8] email client software which also functions as a full personal information manager with a calendar and contactbook, as well as an RSS feed reader, chat client (IRC/XMPP/Matrix), and news client. Available cross-platform, it is operated by the Mozilla Foundation's subsidiary MZLA Technologies Corporation. Thunderbird is an independent, community-driven project that is managed and overseen by the Thunderbird Council, which is elected by the Thunderbird Community. The project strategy was originally modeled after that of Mozilla's Firefox Web browser and is an interface built on top of that Web browser.^[9]

^ "Release Notes". May 14, 2024. Retrieved May 16, 2024.
^ "Beta Notes". May 15, 2024. Retrieved May 16, 2024.
^ "Firefox's addons are written in JavaScript". Rietta. Archived from the original on August 4, 2009. Retrieved December 19, 2009.
^ "Firefox uses an "html.css" stylesheet for default rendering styles". David Walsh. July 10, 2008. Retrieved December 19, 2009.
^ "Thunderbird 78.0 System Requirements". mozilla.org. Mozilla Messaging. Retrieved July 17, 2020.
^ Cite error: The named reference languages was invoked but never defined (see the help page).
^ Mozilla Project Licensing Archived 2014-09-04 at the Wayback Machine Mozilla.org
^ "Debian and Mozilla – a study in trademarks". LWN.net. Retrieved September 18, 2010.
^ "Why We're Rebuilding The Thunderbird Interface From Scratch". MZLA Technologies Corporation. February 9, 2023. Retrieved February 11, 2023. Thunderbird is literally a bunch of code running on top of Firefox. All the tabs and sections you see in our applications are just browser tabs with a custom user interface.