Thunderbird email client

Mozilla Thunderbird is a free and open-source cross-platform email client, newsgroup, business news, and chat client developed by the Mozilla Foundation and its subsidiary, MZLA Technologies Corporation. The project's strategy was originally modeled after that of the Mozilla Firefox web browser. It was first launched in 2003 as a standalone mail project and has since become one of the most popular open-source communication tools worldwide.

Because Thunderbird is open-source software, its 'manufacturing' or development occurs globally through a distributed network of professional developers and community contributors. The core oversight and management are handled by MZLA Technologies Corporation, which is based in the United States. The software is designed to be highly customizable, supporting various operating systems and localized into dozens of languages by community members around the globe.

Ownership of Thunderbird resides with the Mozilla Foundation, a non-profit organization dedicated to ensuring the internet remains a public resource that is open and accessible to all. In early 2020, the project was moved to a new wholly-owned subsidiary, MZLA Technologies Corporation, to allow for more flexibility in exploring new products and services and to facilitate a more sustainable development model for the future.