Update - in the mobile plan for 2026, not yet released, we plan to do some exploration of this idea. So there may not be code released, but there will be an evaluation.
It would be nice if it would be a separate app rather than part of Thunderbird Mobile. Even better, Lightning name could have a return in this form as Thunderbird Lightning as a dedicated mobile calendar app.
I got sick of using outlook on my mobile especially after the ADD been added. though, I switched to my favorite thunderbird as I am a long time user on Desktops. I was realy surprised that there is no Calender. I am glad to see many request here, and hope to see one if not better than outlook then at least equivalent.
Thanks team, your work has been appreciated for years!