Consider me sold. But for the love of everything, please update Thunderbird to natively have “start at system startup” , “minimize on startup”, “close to minimize”, and “minimize to tray” features. I know there are extensions for them but they are fickle getting them to play nicely with each other and temperamental depending on which linux distro and desktop you use.
as for the start on login feature, this is usually configurable in most desktop environments
The only reason I don’t use Thunderbird is because I want to minimize it. I do not want to alt-tab cycle through background apps like email or music (looking at you, Rhythmbox). Why is that such a difficult UX thing to understand? And I don’t want to install add-ons for that.
I hope they succeed. While a normal user might not need more than Thunderbird currently provides, organizations are mkre or less bound to solutions like M365 for their versatility.