diff --git a/3rdparty/Sabre/DAV/Server.php b/3rdparty/Sabre/DAV/Server.php
index 3d76d4f191..28c69188a3 100644
--- a/3rdparty/Sabre/DAV/Server.php
+++ b/3rdparty/Sabre/DAV/Server.php
@@ -648,7 +648,7 @@ class Sabre_DAV_Server {
      * @return void
      */
     protected function httpDelete($uri) {
-
+		
         if (!$this->broadcastEvent('beforeUnbind',array($uri))) return;
         $this->tree->delete($uri);
 
diff --git a/apps/calendar/lib/connector_sabre.php b/apps/calendar/lib/connector_sabre.php
index 263fb7ffde..47bf4f202e 100644
--- a/apps/calendar/lib/connector_sabre.php
+++ b/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);
 	}