Thunderbird 115 is out and it sucks less 
blog.thunderbird.net Our Fastest, Most Beautiful Release Ever: Thunderbird 115 "Supernova" Is Here!
More than just a yearly release, Supernova is a modernized overhaul of Thunderbird, but still feels comfortable and familiar.
Look, I know that you all stopped using Thunderbird in about 2003. I know this. You know this. But I still like it.