The current Thunderbird logo for the email application with calendar and contact features is a round symbol in which a blue bird wraps around a white-and-light-blue envelope. The bird’s head is placed in the upper right part, the tail extends to the left, and the symbol itself uses blue and light blue shades with small purple accents. This version of the logo was introduced by the project in 2023 together with the release of Thunderbird 115 Supernova. During the redesign, the team preserved the link to earlier versions of the symbol and Thunderbird’s historical connection with Mozilla, and the new version was created with the participation of Jon Hicks, the designer of the original Firefox and Thunderbird logos.
Thunderbird is a project from the United States developed by MZLA Technologies Corporation, a subsidiary of Mozilla Foundation. Thunderbird’s history began in 2003, and version 1.0 was released on December 7, 2004 as a free, secure, and customizable alternative to closed-source email programs. Today, Thunderbird is positioned as an open-source application for email, calendar, and contacts, and the project itself is supported by its own team and an international community of contributors. In terms of scale, it is a major software solution: Thunderbird records millions of free downloads each year, and the project team directly states that the application is used by tens of millions of people.
