diff --git a/addressbook/inc/class.addressbook_groupdav.inc.php b/addressbook/inc/class.addressbook_groupdav.inc.php
index e50a5ddb76..c19b58277d 100644
--- a/addressbook/inc/class.addressbook_groupdav.inc.php
+++ b/addressbook/inc/class.addressbook_groupdav.inc.php
@@ -276,9 +276,10 @@ class addressbook_groupdav extends groupdav_handler
 	 *
 	 * @param array &$options
 	 * @param int $id
+	 * @param int $user=null account_id
 	 * @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
 	 */
-	function get(&$options,$id)
+	function get(&$options,$id,$user=null)
 	{
 		if (!is_array($contact = $this->_common_get_put_delete('GET',$options,$id)))
 		{
diff --git a/calendar/inc/class.calendar_groupdav.inc.php b/calendar/inc/class.calendar_groupdav.inc.php
index 8919152f79..c8cd75d5b3 100644
--- a/calendar/inc/class.calendar_groupdav.inc.php
+++ b/calendar/inc/class.calendar_groupdav.inc.php
@@ -220,7 +220,7 @@ error_log(__METHOD__."($path,,".array2string($start).") filter=".array2string($f
 				//error_log(__FILE__ . __METHOD__ . "Calendar Data : $calendar_data");
 				if ($calendar_data)
 				{
-					$content = $this->iCal($event);
+					$content = $this->iCal($event,$filter['users']);
 					$props[] = HTTP_WebDAV_Server::mkprop('getcontentlength',bytes($content));
 					$props[] = HTTP_WebDAV_Server::mkprop(groupdav::CALDAV,'calendar-data',$content);
 				}
@@ -382,15 +382,16 @@ error_log(__METHOD__."($path,,".array2string($start).") filter=".array2string($f
 	 *
 	 * @param array &$options
 	 * @param int $id
+	 * @param int $user=null account_id
 	 * @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
 	 */
-	function get(&$options,$id)
+	function get(&$options,$id,$user=null)
 	{
 		if (!is_array($event = $this->_common_get_put_delete('GET',$options,$id)))
 		{
 			return $event;
 		}
-		$options['data'] = $this->iCal($event);
+		$options['data'] = $this->iCal($event,$user);
 		$options['mimetype'] = 'text/calendar; charset=utf-8';
 		header('Content-Encoding: identity');
 		header('ETag: '.$this->get_etag($event));
@@ -403,13 +404,23 @@ error_log(__METHOD__."($path,,".array2string($start).") filter=".array2string($f
 	 * Taking into account virtual an real exceptions for recuring events
 	 *
 	 * @param array $event
+	 * @param int $user=null account_id of calendar to display
 	 * @return string
 	 */
-	private function iCal(array $event)
+	private function iCal(array $event,$user=null)
 	{
 		static $handler = null;
 		if (is_null($handler)) $handler = $this->_get_handler();
 
+		if (!$user) $user = $GLOBALS['egw_info']['user']['account_id'];
+
+		// only return alarms in own calendar, not other users calendars
+		if ($user != $GLOBALS['egw_info']['user']['account_id'])
+		{
+			//error_log(__METHOD__.'('.array2string($event).", $user) clearing alarms");
+			$event['alarm'] = array();
+		}
+
 		$events = array($event);
 
 		// for recuring events we have to add the exceptions
@@ -547,8 +558,18 @@ error_log(__METHOD__."($path,,".array2string($start).") filter=".array2string($f
 			}
 			else
 			{
-				// let lightning think the event is added
-				$retval = '201 Created';
+				$retval = '204 No Content';
+
+				// lightning will pop up the alarm, as long as the Sequence (etag) does NOT change
+				// --> update the etag alone, if user has no edit rights
+				if ($this->agent == 'lightning' && !$this->check_access(EGW_ACL_EDIT, $oldEvent) &&
+					isset($oldEvent['participants'][$GLOBALS['egw_info']['user']['account_id']]))
+				{
+					// just update etag in database
+					$GLOBALS['egw']->db->update($this->bo->so->cal_table,'cal_etag=cal_etag+1',array(
+						'cal_id' => $eventId,
+					),__LINE__,__FILE__,'calendar');
+				}
 			}
 		}
 		else
diff --git a/calendar/inc/class.calendar_ical.inc.php b/calendar/inc/class.calendar_ical.inc.php
index bc1f1c2a0d..68e67beca9 100644
--- a/calendar/inc/class.calendar_ical.inc.php
+++ b/calendar/inc/class.calendar_ical.inc.php
@@ -276,7 +276,7 @@ class calendar_ical extends calendar_boupdate
 				}
 				continue;
 			}
-			
+
 			if ($this->log)
 			{
 				error_log(__FILE__.'['.__LINE__.'] '.__METHOD__.
@@ -568,7 +568,7 @@ class calendar_ical extends calendar_boupdate
 									'CUTYPE'   => 'INDIVIDUAL',
 									//'RSVP'     => 'FALSE',
 									);
-								if (!empty($organizerCN)) $options['CN'] = $organizerCN;	
+								if (!empty($organizerCN)) $options['CN'] = $organizerCN;
 								if (!empty($organizerEMail)) $options['EMAIL'] = $organizerEMail;
 								if (!empty($event['owner'])) $options['X-EGROUPWARE-UID'] = $event['owner'];
 								$attributes['ATTENDEE'][] = $organizerURL;
@@ -631,7 +631,7 @@ class calendar_ical extends calendar_boupdate
 								$length = ($event['end'] - $event['start']) / 2;
 								$rrule['UNTIL']->modify($length . ' second');
 							}
-							
+
 							if (!$tzid || $version != '1.0')
 							{
 								if (!isset(self::$tz_cache['UTC']))
@@ -645,7 +645,7 @@ class calendar_ical extends calendar_boupdate
 						if ($version == '1.0')
 						{
 							if ($event['recur_enddate'] && $tzid)
-							{	
+							{
 								$rrule['UNTIL'] = self::getDateTime($rrule['UNTIL'],$tzid);
 							}
 							$attributes['RRULE'] = $rrule['FREQ'].' '.$rrule['UNTIL'];
@@ -690,7 +690,7 @@ class calendar_ical extends calendar_boupdate
 								$event['recur_exception'] = $days;
 								if ($version != '1.0') $parameters['EXDATE']['VALUE'] = 'DATE';
 							}
-							if ($this->productManufacturer == 'groupdav' && 
+							if ($this->productManufacturer == 'groupdav' &&
 								($this->productName == 'iphone' || $this->productName == 'davkit'))
 							{
 								foreach ($event['recur_exception'] as $exdate)
@@ -917,14 +917,14 @@ class calendar_ical extends calendar_boupdate
 
 					// RFC requires DESCRIPTION for DISPLAY
 					if (!$event['title'] && !$description) continue;
-					
+
 					if ($this->productName == 'lightning')
 					{
 						// return only future alarms to lightning
 						if (($nextOccurence = $this->read($event['id'], $this->now_su + $alarmData['offset'], false, 'server')))
 						{
 							$alarmData['time'] = $nextOccurence['start'] - $alarmData['offset'];
-							$alarmData['offset'] = false;	
+							$alarmData['offset'] = false;
 						}
 						else
 						{
@@ -932,12 +932,12 @@ class calendar_ical extends calendar_boupdate
 						}
 					}
 
-					if (!empty($event['whole_day']) && $alarmData['offset'])		
+					if (!empty($event['whole_day']) && $alarmData['offset'])
 					{
 						$alarmData['time'] = $event['start'] - $alarmData['offset'];
 						$alarmData['offset'] = false;
-					} 
-					
+					}
+
 					$valarm = Horde_iCalendar::newComponent('VALARM',$vevent);
 					if ($alarmData['offset'])
 					{
@@ -1118,7 +1118,7 @@ class calendar_ical extends calendar_boupdate
 		{
 			calendar_groupdav::fix_series($events);
 		}
-		
+
 		if ($this->tzid)
 		{
 			$tzid = $this->tzid;
@@ -1127,9 +1127,9 @@ class calendar_ical extends calendar_boupdate
 		{
 			$tzid = egw_time::$user_timezone->getName();
 		}
-		
+
 		date_default_timezone_set($tzid);
-		
+
 		foreach ($events as $event)
 		{
 			if (!is_array($event)) continue; // the iterator may return false
@@ -1149,7 +1149,7 @@ class calendar_ical extends calendar_boupdate
 			}
 
 			$updated_id = false;
-			
+
 			if ($replace)
 			{
 				$event_info['type'] = $event['recur_type'] == MCAL_RECUR_NONE ?
@@ -1423,6 +1423,12 @@ class calendar_ical extends calendar_boupdate
 								$alarm['owner'] = $this->user;
 								$alarm['all'] = false;
 
+								// if no edit rights, allow participants to set alarms directly (like status)
+								if ($event_info['stored_event'] && !$event_info['acl_edit'])
+								{
+									$this->save_alarm($event_info['stored_event']['id'], $alarm);
+								}
+
 								if (is_array($event_info['stored_event'])
 										&& count($event_info['stored_event']['alarm']) > 0)
 								{
@@ -1458,7 +1464,7 @@ class calendar_ical extends calendar_boupdate
 					}
 				}
 			}
-			
+
 			if ($this->log)
 			{
 				error_log(__FILE__.'['.__LINE__.'] '.__METHOD__ . '('
@@ -1508,7 +1514,7 @@ class calendar_ical extends calendar_boupdate
 						if (is_array($days))
 						{
 							$recur_exceptions = array();
-							
+
 							foreach ($event['recur_exception'] as $recur_exception)
 							{
 								if (isset($days[$recur_exception]))
@@ -1581,7 +1587,7 @@ class calendar_ical extends calendar_boupdate
 									array_unique(array_merge($event_info['master_event']['recur_exception'],
 										array($event['recurrence'])));
 							}
-							
+
 							$event['reference'] = $event_info['master_event']['id'];
 							$event['category'] = $event_info['master_event']['category'];
 							$event['owner'] = $event_info['master_event']['owner'];
@@ -2128,7 +2134,7 @@ class calendar_ical extends calendar_boupdate
 		{
 			return new egw_ical_iterator($_vcalData,'VCALENDAR',$charset,array($this,'_ical2egw_callback'),array($this->tzid,$principalURL));
 		}
-		
+
 		if ($this->tzid)
 		{
 			$tzid = $this->tzid;
@@ -2137,9 +2143,9 @@ class calendar_ical extends calendar_boupdate
 		{
 			$tzid = egw_time::$user_timezone->getName();
 		}
-		
+
 		date_default_timezone_set($tzid);
-		
+
 		$events = array();
 		$vcal = new Horde_iCalendar;
 		if (!$vcal->parsevCalendar($_vcalData, 'VCALENDAR', $charset))
@@ -2177,7 +2183,7 @@ class calendar_ical extends calendar_boupdate
 	function _ical2egw_callback(Horde_iCalendar $component, $tzid, $principalURL='')
 	{
 		//unset($component->_container); _debug_array($component);
-		
+
 		if ($this->log)
 		{
 			error_log(__FILE__.'['.__LINE__.'] '.__METHOD__.'() '.get_class($component)." found\n",3,$this->logfile);
@@ -2238,7 +2244,7 @@ class calendar_ical extends calendar_boupdate
 			}
 			return false;
 		}
-		
+
 		/*
 		$mozillaACK = $component->getAttribute('X-MOZ-LASTACK');
 		if ($this->productName == 'lightning' && !is_a($mozillaACK, 'PEAR_Error'))
diff --git a/calendar/inc/class.calendar_so.inc.php b/calendar/inc/class.calendar_so.inc.php
index 457787d2b7..8a8f1fa8f7 100644
--- a/calendar/inc/class.calendar_so.inc.php
+++ b/calendar/inc/class.calendar_so.inc.php
@@ -1083,18 +1083,18 @@ ORDER BY cal_user_type, cal_usre_id
 					$alarm['time'] = $event['cal_start'] - $alarm['offset'];
 				}
 
-				$start = (int)time() + $alarm['offset'];
-				if ($alarm['time'] < $start)
+				if ($alarm['time'] < time())
 				{
 					//pgoerzen: don't add an alarm in the past
 					if ($event['recur_type'] == MCAL_RECUR_NONE) continue;
+					$start = (int)time() + $alarm['offset'];
 					$event['start'] = $event['cal_start'];
 					$event['end'] = $event['cal_end'];
 					$event['tzid'] = $event['cal_tzid'];
 					$rrule = calendar_rrule::event2rrule($event, false);
 					foreach ($rrule as $time)
 					{
-						if ($start< ($ts = egw_time::to($time,'server'))) break;
+						if ($start < ($ts = egw_time::to($time,'server'))) break;
 						$ts = 0;
 					}
 					if (!$ts) continue;
diff --git a/infolog/inc/class.infolog_groupdav.inc.php b/infolog/inc/class.infolog_groupdav.inc.php
index 5e92564171..debb0e3a00 100644
--- a/infolog/inc/class.infolog_groupdav.inc.php
+++ b/infolog/inc/class.infolog_groupdav.inc.php
@@ -331,9 +331,10 @@ class infolog_groupdav extends groupdav_handler
 	 *
 	 * @param array &$options
 	 * @param int $id
+	 * @param int $user=null account_id
 	 * @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
 	 */
-	function get(&$options,$id)
+	function get(&$options,$id,$user=null)
 	{
 		if (!is_array($task = $this->_common_get_put_delete('GET',$options,$id)))
 		{
diff --git a/phpgwapi/inc/class.groupdav.inc.php b/phpgwapi/inc/class.groupdav.inc.php
index c620fc29d4..04437eedc5 100644
--- a/phpgwapi/inc/class.groupdav.inc.php
+++ b/phpgwapi/inc/class.groupdav.inc.php
@@ -400,7 +400,7 @@ class groupdav extends HTTP_WebDAV_Server
 		{
 			$account_lid = $GLOBALS['egw_info']['user']['account_lid'];
 		}
-		
+
 		if (strlen($user_preferences['calendar']['display_color']) == 9 &&
 			$user_preferences['calendar']['display_color'][0] == '#')
 		{
@@ -410,7 +410,7 @@ class groupdav extends HTTP_WebDAV_Server
 		{
 			$display_color = '#0040A0FF';
 		}
-		
+
 		$account = $this->accounts->read($account_lid);
 		$displayname = $GLOBALS['egw']->translation->convert($account['account_fullname'],
 				$GLOBALS['egw']->translation->charset(),'utf-8');
@@ -548,7 +548,7 @@ class groupdav extends HTTP_WebDAV_Server
 		}
 		if (($handler = self::app_handler($app)))
 		{
-			return $handler->get($options,$id);
+			return $handler->get($options,$id,$user);
 		}
 		error_log(__METHOD__."(".array2string($options).") 501 Not Implemented");
 		return '501 Not Implemented';
diff --git a/phpgwapi/inc/class.groupdav_handler.inc.php b/phpgwapi/inc/class.groupdav_handler.inc.php
index 3ff46b6e44..dfea82f244 100644
--- a/phpgwapi/inc/class.groupdav_handler.inc.php
+++ b/phpgwapi/inc/class.groupdav_handler.inc.php
@@ -135,9 +135,10 @@ abstract class groupdav_handler
 	 *
 	 * @param array &$options
 	 * @param int $id
+	 * @param int $user=null account_id
 	 * @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
 	 */
-	abstract function get(&$options,$id);
+	abstract function get(&$options,$id,$user=null);
 
 	/**
 	 * Handle get request for an applications entry
diff --git a/phpgwapi/inc/class.groupdav_principals.inc.php b/phpgwapi/inc/class.groupdav_principals.inc.php
index 3d2cecf464..a8838e4ba3 100644
--- a/phpgwapi/inc/class.groupdav_principals.inc.php
+++ b/phpgwapi/inc/class.groupdav_principals.inc.php
@@ -13,7 +13,7 @@
 
 /**
  * EGroupware: GroupDAV access: groupdav/caldav/carddav principals handlers
- * 
+ *
  * @todo All principal urls should either contain no account_lid (eg. base64 of it) or use urlencode($account_lid)
  */
 class groupdav_principals extends groupdav_handler
@@ -92,7 +92,7 @@ class groupdav_principals extends groupdav_handler
 		{
 			$displayname = translation::convert($account['account_fullname'],
 				translation::charset(),'utf-8');
-			
+
 			$props = array(
 				HTTP_WebDAV_Server::mkprop('displayname',$displayname),
 				HTTP_WebDAV_Server::mkprop('getetag',$this->get_etag($account)),
@@ -105,7 +105,7 @@ class groupdav_principals extends groupdav_handler
 				HTTP_WebDAV_Server::mkprop(groupdav::CARDDAV,'addressbook-home-set',array(
 					HTTP_WebDAV_Server::mkprop('href',$this->base_uri.'/'.$account['account_lid'].'/'))),
 			);
-			
+
 			foreach($this->accounts->memberships($account['account_id']) as $gid => $group)
 			{
 				$props[] = HTTP_WebDAV_Server::mkprop('group-membership',$this->base_uri.'/groups/'.$group);
@@ -440,9 +440,10 @@ class groupdav_principals extends groupdav_handler
 	 *
 	 * @param array &$options
 	 * @param int $id
+	 * @param int $user=null account_id
 	 * @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
 	 */
-	function get(&$options,$id)
+	function get(&$options,$id,$user=null)
 	{
 		if (!is_array($account = $this->_common_get_put_delete('GET',$options,$id)))
 		{
@@ -533,7 +534,7 @@ class groupdav_principals extends groupdav_handler
 		}
 		return 'EGw-'.$account['account_id'].':'.md5(serialize($account)).
 			// as the pricipal of current user is influenced by GroupDAV prefs, we have to include them in the etag
-			($account['account_id'] == $GLOBALS['egw_info']['user']['account_id'] ? 
+			($account['account_id'] == $GLOBALS['egw_info']['user']['account_id'] ?
 				':'.md5(serialize($GLOBALS['egw_info']['user']['preferences']['groupdav'])) : '').'-wGE';
 	}
 }
\ No newline at end of file