Kudos to the Thunderbird team for improving TB so much over the past few years, it really helped that they split from Mozilla. K9-Mail (which is now TB) also strongly benefitted from this. Maybe Mozilla will start listening to their users someday...
Thunderbird has actually come back to Mozilla around 2017: https://blog.thunderbird.net/2017/05/thunderbirds-future-hom...
And has been operating as a fully fledged subsidiary of the foundation since 2020: https://blog.thunderbird.net/2020/01/thunderbirds-new-home/
Thunderbird has actually come back to Mozilla around 2017: https://blog.thunderbird.net/2017/05/thunderbirds-future-hom...
And has been operating as a fully fledged subsidiary of the foundation since 2020: https://blog.thunderbird.net/2020/01/thunderbirds-new-home/