diff --git a/calendar/inc/class.calendar_bo.inc.php b/calendar/inc/class.calendar_bo.inc.php
index f80c7de0cb..40c1cbcc11 100644
--- a/calendar/inc/class.calendar_bo.inc.php
+++ b/calendar/inc/class.calendar_bo.inc.php
@@ -1918,14 +1918,14 @@ class calendar_bo
 	/**
 	 * Get the etag for an entry
 	 *
+	 * As all update routines (incl. set_status and add/delete alarms) update (series master) modified timestamp,
+	 * we do NOT need any special handling for series master anymore
+	 *
 	 * @param array|int|string $event array with event or cal_id, or cal_id:recur_date for virtual exceptions
 	 * @param string &$schedule_tag=null on return schedule-tag (egw_cal.cal_id:egw_cal.cal_etag, no participant modifications!)
-	 * @param boolean $client_share_uid_excpetions Does client understand exceptions to be included in VCALENDAR component of series master sharing its UID
-	 * @param boolean $master_only=false only take into account recurrance masters
-	 * 	(for ActiveSync which does not support different participants/status on recurrences/exceptions!)
 	 * @return string|boolean string with etag or false
 	 */
-	function get_etag($entry, &$schedule_tag=null, $client_share_uid_excpetions=true,$master_only=false)
+	function get_etag($entry, &$schedule_tag=null)
 	{
 		if (!is_array($entry))
 		{
@@ -1936,35 +1936,6 @@ class calendar_bo
 		$etag = $schedule_tag = $entry['id'].':'.$entry['etag'];
 		$etag .= ':'.$entry['modified'];
 
-		// include exception etags into our own etag, if exceptions are included
-		if ($client_share_uid_excpetions && //!empty($entry['uid']) &&
-			$entry['recur_type'] != MCAL_RECUR_NONE && $entry['recur_exception'])
-		{
-			foreach($this->so->get_cal_data(array(
-				'cal_reference' => $entry['id'],
-			), 'cal_id,cal_reference,cal_etag,cal_modified'.(!$master_only ? ',cal_user_modified' : '')) as $recurrence)
-			{
-				$recurrence = egw_db::strip_array_keys($data, 'cal_');
-				if ($recurrence['reference'] && $recurrence['id'] != $entry['id'])	// ignore series master
-				{
-					// modified need to be max from modified and user_modified
-					if (!$master_only && $recurrence['modified'] < $recurrence['user_modified'])
-					{
-						$recurrence['modified'] = $recurrence['user_modified'];
-					}
-					$exception_etag = $this->get_etag($recurrence);
-					// if $master_only, only add cal_etag, not max. user modification date
-					if ($master_only) list(,$exception_etag) = explode(':',$exception_etag);
-
-					$exception_etags .= ':'.$exception_etag;
-				}
-			}
-			if ($exception_etags)
-			{
-				$etag .= ':'.md5($exception_etags);	// limit size, as there can be many exceptions
-			}
-			//error_log(__METHOD__."($entry[id]: $entry[title]) returning $etag ".function_backtrace());
-		}
 		//error_log(__METHOD__ . "($entry[id],$client_share_uid_excpetions) entry=".array2string($entry)." --> etag=$etag");
 		return $etag;
 	}
diff --git a/calendar/inc/class.calendar_boupdate.inc.php b/calendar/inc/class.calendar_boupdate.inc.php
index a0d34e064e..fc2cb7c806 100644
--- a/calendar/inc/class.calendar_boupdate.inc.php
+++ b/calendar/inc/class.calendar_boupdate.inc.php
@@ -1755,7 +1755,7 @@ class calendar_boupdate extends calendar_bo
 
 		$GLOBALS['egw']->contenthistory->updateTimeStamp('calendar', $cal_id, 'modify', $this->now);
 
-		return $this->so->save_alarm($cal_id,$alarm, $this->now);
+		return $this->so->save_alarm($cal_id,$alarm);
 	}
 
 	/**
@@ -1775,7 +1775,7 @@ class calendar_boupdate extends calendar_bo
 
 		$GLOBALS['egw']->contenthistory->updateTimeStamp('calendar', $cal_id, 'modify', $this->now);
 
-		return $this->so->delete_alarm($id, $this->now);
+		return $this->so->delete_alarm($id);
 	}
 
 	/**
diff --git a/calendar/inc/class.calendar_so.inc.php b/calendar/inc/class.calendar_so.inc.php
index b717dec2a4..37b19e5991 100644
--- a/calendar/inc/class.calendar_so.inc.php
+++ b/calendar/inc/class.calendar_so.inc.php
@@ -7,7 +7,7 @@
  * @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
  * @author Christian Binder <christian-AT-jaytraxx.de>
  * @author Joerg Lehrke <jlehrke@noc.de>
- * @copyright (c) 2005-11 by RalfBecker-At-outdoor-training.de
+ * @copyright (c) 2005-13 by RalfBecker-At-outdoor-training.de
  * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
  * @version $Id$
  */
@@ -68,6 +68,9 @@ define('WEEK_s',7*DAY_s);
  * DB-model uses egw_cal_user.cal_status='X' for participants who got deleted. They never get returned by
  * read or search methods, but influence the ctag of the deleted users calendar!
  *
+ * All update methods not take care to update modification time of (evtl. existing) series master too,
+ * to force an etag, ctag and sync-token change! Methods not doing that are private to this class.
+ *
  * range_start/_end in main-table contains start and end of whole event series (range_end is NULL for unlimited recuring events),
  * saving the need to always join dates table, to query non-enumerating recuring events (like CalDAV or ActiveSync does).
  * This effectivly stores MIN(cal_start) and MAX(cal_end) permanently as column in main-table and improves speed tremendiously
@@ -1321,7 +1324,7 @@ ORDER BY cal_user_type, cal_usre_id
 				{
 					continue;	// pgoerzen: don't add alarm in the past
 				}
-				$this->save_alarm($cal_id,$alarm);
+				$this->save_alarm($cal_id, $alarm, false);	// false: not update modified, we do it anyway
 			}
 		}
 		if (is_null($etag))
@@ -1683,13 +1686,7 @@ ORDER BY cal_user_type, cal_usre_id
 		// update modified and modifier in main table
 		if (($ret = $this->db->affected_rows()))
 		{
-			$this->updateModified($cal_id);
-
-			// if event is an exception: update modified of master, to force etag, ctag and sync-token change
-			if (($master_id = $this->db->select($this->cal_table, 'cal_reference', array('cal_id' => $cal_id), __LINE__, __FILE__)->fetchColumn()))
-			{
-				$this->updateModified($master_id);
-			}
+			$this->updateModified($cal_id, true);	// true = update series master too
 		}
 		//error_log(__METHOD__."($cal_id,$user_type,$user_id,$status,$recur_date) = $ret");
 		return $ret;
@@ -1770,6 +1767,9 @@ ORDER BY cal_user_type, cal_usre_id
 
 		$this->delete_alarms($cal_id);
 
+		// update timestamp of series master, updates own timestamp too, which does not hurt ;-)
+		$this->updateModified($cal_id, true);
+
 		foreach($this->all_tables as $table)
 		{
 			$this->db->delete($table,array('cal_id'=>$cal_id),__LINE__,__FILE__,'calendar');
@@ -1859,10 +1859,10 @@ ORDER BY cal_user_type, cal_usre_id
 	 *
 	 * @param int $cal_id Id of the calendar-entry
 	 * @param array $alarm array with fields: text, owner, enabled, ..
-	 * @param timestamp $now=0 timestamp for modification of related event
+	 * @param boolean $update_modified=true call update modified, default true
 	 * @return string id of the alarm
 	 */
-	function save_alarm($cal_id, $alarm, $now=0)
+	function save_alarm($cal_id, $alarm, $update_modified=true)
 	{
 		//echo "<p>save_alarm(cal_id=$cal_id, alarm="; print_r($alarm); echo ")</p>\n";
 		//error_log(__METHOD__."(.$cal_id,$now,".array2string($alarm).')');
@@ -1890,21 +1890,20 @@ ORDER BY cal_user_type, cal_usre_id
 		}
 
 		// update the modification information of the related event
-		if (!$now) $now = time();
-		$modifier = $GLOBALS['egw_info']['user']['account_id'];
-		$this->db->update($this->cal_table, array('cal_modified' => $now, 'cal_modifier' => $modifier),
-			array('cal_id' => $cal_id), __LINE__, __FILE__, 'calendar');
+		if ($update_modified) $this->updateModified($cal_id, true);
 
 		return $id;
 	}
 
 	/**
-	 * delete all alarms of a calendar-entry
+	 * Delete all alarms of a calendar-entry
+	 *
+	 * Does not update timestamps of series master, therefore private!
 	 *
 	 * @param int $cal_id Id of the calendar-entry
 	 * @return int number of alarms deleted
 	 */
-	function delete_alarms($cal_id)
+	private function delete_alarms($cal_id)
 	{
 		$alarms = $this->read_alarms($cal_id);
 
@@ -1919,19 +1918,15 @@ ORDER BY cal_user_type, cal_usre_id
 	 * delete one alarms identified by its id
 	 *
 	 * @param string $id alarm-id is a string of 'cal:'.$cal_id.':'.$alarm_nr, it is used as the job-id too
-	 * @param timestamp $now=0 timestamp for modification of related event
 	 * @return int number of alarms deleted
 	 */
-	function delete_alarm($id, $now=0)
+	function delete_alarm($id)
 	{
 		// update the modification information of the related event
 		list(,$cal_id) = explode(':',$id);
 		if ($cal_id)
 		{
-			if (!$now) $now = time();
-			$modifier = $GLOBALS['egw_info']['user']['account_id'];
-			$this->db->update($this->cal_table, array('cal_modified' => $now, 'cal_modifier' => $modifier),
-				array('cal_id' => $cal_id), __LINE__, __FILE__, 'calendar');
+			$this->updateModified($cal_id, true);
 		}
 		return $this->async->cancel_timer($id);
 	}
@@ -2453,19 +2448,29 @@ ORDER BY cal_user_type, cal_usre_id
 	}
 
 	/**
-	 * Udates the modification timestamp
+	 * Updates the modification timestamp to force an etag, ctag and sync-token change
 	 *
-	 * @param id		event id
-	 * @param time		new timestamp, default current (server-)time
-	 * @param modifier	uid of the modifier, default current user
+	 * @param int $id event id
+	 * @param int|boolean $update_master=false id of series master or true, to update series master too
+	 * @param int $time=null new timestamp, default current (server-)time
+	 * @param int $modifier=null uid of the modifier, default current user
 	 */
-	function updateModified($id, $time=null, $modifier=null)
+	function updateModified($id, $update_master=false, $time=null, $modifier=null)
 	{
-		if (is_null($time)) $time = time();
+		if (is_null($time) || !$time) $time = time();
 		if (is_null($modifier)) $modifier = $GLOBALS['egw_info']['user']['account_id'];
 
 		$this->db->update($this->cal_table,
 			array('cal_modified' => $time, 'cal_modifier' => $modifier),
 			array('cal_id' => $id), __LINE__,__FILE__, 'calendar');
+
+		// if event is an exception: update modified of master, to force etag, ctag and sync-token change
+		if ($update_master)
+		{
+			if ($update_master !== true || ($update_master = $this->db->select($this->cal_table, 'cal_reference', array('cal_id' => $id), __LINE__, __FILE__)->fetchColumn()))
+			{
+				$this->updateModified($update_master, false, $time, $modifier);
+			}
+		}
 	}
 }