Unfortunately CalDAV and CarDAV are not supported natively by Android. In order to utilize a CalDAV or CarDAV server, an android user needs to purchase both a

Unfortunately CalDAV and CarDAV are not supported natively by Android. In order to utilize a CalDAV or CarDAV server, an android user needs to purchase both a CalDAV adapter [1] and a CarDAV adapter [2]. Both of these products are in beta and last time I checked they were lacking support for much of the protocol. It's really a shame that Google doesn't support open standards for contacts and calendar in Android. [1] https://play.google.com/store/apps/details?id=org.dmfs.caldav.lib https://play.google.com/store/apps/details?id=org.dmfs.calda... [2]https://play.google.com/store/apps/details?id=org.dmfs.carddav.Sync https://play.google.com/store/apps/details?id=org.dmfs.cardd...