The Thunderbird Privacy Notice explains how data is collected, processed, and shared across Thunderbird desktop and mobile applications to support email, calendar, add-ons, updates, and security features while keeping message content and core personal data stored locally on the user’s device. It is issued by MZLA Technologies Corporation, a Mozilla subsidiary, and aligns with Mozilla’s broader privacy framework, making it suitable for assessing privacy practices in open-source, user-controlled communication software.