Server verhindert beim OSX Client einen Delete

apps/calendar/lib/connector_sabre.php

@@ -206,6 +206,10 @@ class OC_Connector_Sabre_CalDAV extends Sabre_CalDAV_Backend_Abstract {
 	 * @return void
 	 */
 	public function deleteCalendar($calendarId) {
+	    if(preg_match( '=iCal/[1-4]?.*Mac OS X/10.[1-6](.[0-9])?=', $_SERVER['HTTP_USER_AGENT'] )){
+	    	throw new Sabre_DAV_Exception_Forbidden("Action is not possible with OSX 10.6.x", 403);
+		}
+		
 		OC_Calendar_Calendar::deleteCalendar($calendarId);
 	}