THUNDERBIRD SUPERNOVA UPDATE:

Massive UX/UI updates to Thunderbird coming in January (on our alpha "Daily" channel). Get Daily on https://thunderbird.net -scroll down the page a bit to choose version: Stable, Beta or Daily). Remember Daily is Alpha quality, there will be really rough edges, but I use it every day and am very productive. 😁

These big changes should hit Beta in February or early March, at the latest. Then it's just polish and shine until the stable, yearly release in July.