i sync fastmail's calendar with the built-in android calendar app by using caldav. https://play.google.com/store/apps/details?id=org.dmfs.caldav.lib https://pl

i sync fastmail's calendar with the built-in android calendar app by using caldav. https://play.google.com/store/apps/details?id=org.dmfs.caldav.lib https://play.google.com/store/apps/details?id=org.dmfs.calda...