Thunderbird has actually come back to Mozilla around 2017:

babolivier • yesterday at 8:36 AM • 1 reply • view on HN

And has been operating as a fully fledged subsidiary of the foundation since 2020: https://blog.thunderbird.net/2020/01/thunderbirds-new-home/

sunaookami • yesterday at 10:31 AM

Thanks for the correction! Wasn't it under the Mozilla Corporation before? It's clear that there was a cultural shift at Thunderbird either way.

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