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Thunderbird is (amazingly) funded entirely by donations from users. The money is hypothecated for that purpose. There are so few good email clients now they get enough donors.

Source: someone I know who works there

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Wait, you can donate for Thunderbird specifically?

You can! Thunderbird lives in a separate entity outside the main Mozillasphere called MZLA. I've given a few times in the past and use it for personal use, but my workplace recently banned Thunderbird.

https://www.thunderbird.net/en-US/donate/

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