Mozilla Thunderbird is a free and open-source cross-platform email client, personal information manager, news client, RSS and chat client developed by the Mozilla Foundation and operated by subsidiary MZLA Technologies Corporation.
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Mozilla Thunderbird is an email, newsgroup, news feed, and chat client with personal information manager (PIM) functionality, inbuilt since version 78.
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Mozilla Thunderbird manages multiple email, newsgroup, and news feed accounts and supports multiple identities within accounts.
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Mozilla Thunderbird provides basic support for system-specific new email notifications and can be extended with advanced notification support using an add-on.
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Mozilla Thunderbird provides mailbox format support using plugins, but this feature is not yet enabled due to related work in progress.
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Mozilla Thunderbird uses Mork and MozStorage (which is based on SQLite) for its internal database.
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Since version 38, Mozilla Thunderbird has integrated support for automatic linking of large files instead of attaching them directly to the mail message.
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Mozilla Thunderbird provides a wysiwyg editor for composing messages formatted with HTML.
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In June 2022, the Mozilla Thunderbird project announced that it would be collaborating with email client K-9 for Android to build a Mozilla Thunderbird version for Android.
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French military uses Mozilla Thunderbird and contributes to its security features, which are claimed to match the requirements for NATO's closed messaging system.
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Significant work on Mozilla Thunderbird restarted with the announcement that from version 1.
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On July 26, 2007, the Mozilla Foundation announced that Thunderbird would be developed by an independent organization, because the Mozilla Corporation was focusing on Mozilla Firefox development.
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On September 17, 2007, the Mozilla Thunderbird Foundation announced the funding of a new internet communications initiative with David Ascher of ActiveState.
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On February 19, 2008, Mozilla Thunderbird Messaging started operations as a subsidiary of the Mozilla Thunderbird Foundation responsible for the development of email and similar communications.
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On July 6, 2012, a confidential memo from Jb Piacentino, the Thunderbird Managing Director at Mozilla, was leaked and published to TechCrunch.
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The memo indicated that Mozilla Thunderbird would be moving some of the team off the project and further development of new features would be left up to the community.
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On July 6, 2012, Mozilla announced the company was dropping the priority of Thunderbird development because the continuous effort to extend Thunderbird's feature set was mostly fruitless.
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The new development model shifted to Mozilla Thunderbird offering only "Extended Support Releases", which deliver security and maintenance updates, while allowing the community to take over the development of new features.
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Mozilla Thunderbird's referred to Thunderbird developers spending large efforts responding to changes to Mozilla technologies, while Firefox was paying a tax to support Thunderbird development.
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Mozilla Thunderbird's said that she does not believe Thunderbird has the potential for "industry-wide impact" that Firefox does.
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On January 28, 2020, the Mozilla Thunderbird Foundation announced that the project would henceforth be operating from a new wholly owned subsidiary, MZLA Technologies Corporation, in order to explore offering products and services that were not previously possible and to collect revenue through partnerships and non-charitable donations.
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The release dates and Gecko versions are exactly the same as Firefox; for example, Firefox 7 and Mozilla Thunderbird 7 were both released on September 27, 2011, and were both based on Gecko 7.
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