SyncML synchronization of the iPhone Calendar with Todo+Cal+Sync
 

Apple does not provide access to the build-in calendar of the iPhone with the current SDK.
Therefore no AppStore application can use the native calendar of the iPhone today. Is this fully true? Not for JB-Users, though!
You can use Todo+Cal+Sync to synchronize your native iPhone Calendar via SyncML.
To learn how, visit my website at http://k.noc.de/