We're the leading open source cross-platform email and calendaring client, free for business and personal use. By donating you'll help ensure it stays that way and contribute towards future development. Will you give today?

While Thunderbird is now an independent project separate from Mozilla, Mozilla has agreed to collect donations on our behalf.

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Contributions go to the Mozilla Foundation, a 501(c)(3) organization based in Mountain View, California, to support Thunderbird. They are tax-deductible in the U.S. to the fullest extent permitted by law.