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Mozilla Thunderbird is a comprehensive email client that also serves as a personal information manager. It integrates email, newsgroup, news feed, and instant messaging functionalities with an array of additional features through extensions. Thunderbird is designed to manage multiple email accounts and supports various identities within each, providing flexibility and organization. It includes quick search, saved search folders, advanced message filtering, message grouping, and tagging to help users manage and find messages efficiently.

Thunderbird ensures security with its built-in support for digital signing and message encryption through OpenPGP and S/MIME. It also incorporates a Bayesian spam filter and supports industry standards for email, such as POP, IMAP, and SMTP, while allowing users to customize its appearance with different themes​​.

The recent Thunderbird 102 update introduced a redesigned message header for enhanced navigation and information visibility, along with out-of-box support for the Matrix chat protocol, ensuring secure and decentralized communication. Thunderbird Supernova is set to bring a modernized interface and improved features like an updated calendar design for better event management and user experience​​​​.

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  • Thunderbird is a free and open-source email client supported by user donations. It operates under a 'Pay What You Want' model, which allows users to contribute financially to support the project if they choose to. There is no fixed price, and it is sustained through the community's generosity​​.