I have never fully solved this problem via synchronisation that does a replication/pasting. My current solutions is two-fold On Android - Business Calendar sub

I have never fully solved this problem via synchronisation that does a replication/pasting. My current solutions is two-fold On Android - Business Calendar subscribes to all On Desktop - Fastmail This however does not solve propagation of busy-status to other calendars. As far as I understand the caldav standart is cumbersome and often misinterpreted by clients.