* [[Thunderbird:Testing|QA testing]] - How to help with quality assurance and testing.
* [https://developer.mozilla.org/en/Thunderbird_Localization Localization] - Information for translators on how to localize Thunderbird.
* [https://support.mozilla.org/products/thunderbird/ Thunderbird Support] - Thunderbird users are supported by the community on support.mozilla.org (SUMO). SUMO has a [https://support.mozilla.org/questions/thunderbird Thunderbird support forum ] and a [https://support.mozilla.org/en-US/products/thunderbird Thunderbird Knowledge Base].
* [[Thunderbird/Docs|Thunderbird Documentation]] - Documentation for developers and users.
* [[Thunderbird/Contributing patches|Contributing patches and fixes]] - How to get started contributing patches and fixes.