diff --git a/calendar/inc/class.calendar_groupdav.inc.php b/calendar/inc/class.calendar_groupdav.inc.php
index 010e00a66c..c0056ae9bc 100644
--- a/calendar/inc/class.calendar_groupdav.inc.php
+++ b/calendar/inc/class.calendar_groupdav.inc.php
@@ -751,6 +751,35 @@ class calendar_groupdav extends groupdav_handler
 		return true;
 	}
 
+	/**
+	 * Return priviledges for current user, default is read and read-current-user-privilege-set
+	 *
+	 * Reimplemented to add read-free-busy and schedule-deliver privilege
+	 *
+	 * @param string $path path of collection
+	 * @param int $user=null owner of the collection, default current user
+	 * @return array with privileges
+	 */
+	public function current_user_privileges($path, $user=null)
+	{
+		$priviledes = parent::current_user_privileges($user);
+
+		if ($this->bo->check_perms(EGW_ACL_FREEBUSY, 0, $user))
+		{
+			$priviledes['read-free-busy'] = HTTP_WebDAV_Server::mkprop(groupdav::CALDAV, 'read-free-busy', '');
+
+			if (substr($path, -8) == '/outbox/' && $this->bo->check_acl_invite($user))
+			{
+				$priviledes['schedule-send'] = HTTP_WebDAV_Server::mkprop(groupdav::CALDAV, 'schedule-send', '');
+			}
+		}
+		if (substr($path, -7) == '/inbox/' && $this->bo->check_acl_invite($user))
+		{
+			$priviledes['schedule-deliver'] = HTTP_WebDAV_Server::mkprop(groupdav::CALDAV, 'schedule-deliver', '');
+		}
+		return $priviledes;
+	}
+
 	/**
 	 * Fix event series with exceptions, called by calendar_ical::importVCal():
 	 *	a) only series master = first event got cal_id from URL
@@ -761,9 +790,6 @@ class calendar_groupdav extends groupdav_handler
 	 */
 	static function fix_series(array &$events)
 	{
-		//foreach($events as $n => $event) error_log(__METHOD__." $n before: ".array2string($event));
-		//$master =& $events[0];
-
 		$bo = new calendar_boupdate();
 
 		// get array with orginal recurrences indexed by recurrence-id
diff --git a/phpgwapi/inc/class.groupdav.inc.php b/phpgwapi/inc/class.groupdav.inc.php
index d3e3337178..04f8a0edeb 100644
--- a/phpgwapi/inc/class.groupdav.inc.php
+++ b/phpgwapi/inc/class.groupdav.inc.php
@@ -27,6 +27,8 @@ require_once('HTTP/WebDAV/Server.php');
  * - /<username>/             users home-set with
  * - /<username>/addressbook/ addressbook of user or group <username> given the user has rights to view it
  * - /<username>/calendar/    calendar of user <username> given the user has rights to view it
+ * - /<username>/inbox/       scheduling inbox of user <username>
+ * - /<username>/outbox/      scheduling outbox of user <username>
  * - /<username>/infolog/     InfoLog's of user <username> given the user has rights to view it
  * - /addressbook/ all addressbooks current user has rights to, announced as directory-gateway now
  * - /calendar/    calendar of current user
@@ -152,7 +154,14 @@ class groupdav extends HTTP_WebDAV_Server
 	var $supported_privileges = array(
 		'all' => array(
 			'*description*' => 'all privileges',
-			'read' => 'read resource',
+			'read' => array(
+				'*description*' => 'read resource',
+				'read-free-busy' => array(
+					'*ns*' => self::CALDAV,
+					'*description*' => 'allow free busy report query',
+					'*only*' => '/calendar/',
+				),
+			),
 			'write' => array(
 				'*description*' => 'write resource',
 				'write-properties' => 'write resource properties',
@@ -164,6 +173,16 @@ class groupdav extends HTTP_WebDAV_Server
 			'read-acl' => 'read resource access control list',
 			'write-acl' => 'write resource access control list',
 			'read-current-user-privilege-set' => 'read privileges for current principal',
+			'schedule-deliver' => array(
+				'*ns*' => self::CALDAV,
+				'*description*' => 'schedule privileges for current principal',
+				'*only*' => '/inbox/',
+			),
+			'schedule-send' => array(
+				'*ns*' => self::CALDAV,
+				'*description*' => 'schedule privileges for current principal',
+				'*only*' => '/outbox/',
+			),
 		),
 	);
 	/**
@@ -412,7 +431,7 @@ class groupdav extends HTTP_WebDAV_Server
 		{
 			foreach($supported_privileges as $name => $data)
 			{
-				$props['supported-privilege-set'][] = $this->supported_privilege($name, $data);
+				$props['supported-privilege-set'][] = $this->supported_privilege($name, $data, $path);
 			}
 		}
 		if (!isset($props['owner']) && $this->prop_requested('owner') === true)
@@ -441,20 +460,26 @@ class groupdav extends HTTP_WebDAV_Server
 	 * Generate (hierachical) supported-privilege property
 	 *
 	 * @param string $name name of privilege
-	 * @param string|array $data string with describtion or array with agregated privileges plus value for key '*description*'
+	 * @param string|array $data string with describtion or array with agregated privileges plus value for key '*description*', '*ns*', '*only*'
+	 * @param string $path=null path to match with $data['*only*']
 	 * @return array of self::mkprop() arrays
 	 */
-	protected function supported_privilege($name, $data)
+	protected function supported_privilege($name, $data, $path=null)
 	{
 		$props = array();
-		$props[] = self::mkprop('privilege', array(self::mkprop($name, '')));
+		$props[] = self::mkprop('privilege', array(is_array($data) && $data['*ns*'] ?
+			self::mkprop($data['*ns*'], $name, '') : self::mkprop($name, '')));
 		$props[] = self::mkprop('description', is_array($data) ? $data['*description*'] : $data);
 		if (is_array($data))
 		{
-			unset($data['*description*']);
 			foreach($data as $name => $data)
 			{
-				$props[] = $this->supported_privilege($name, $data);
+				if ($name[0] == '*') continue;
+				if (is_array($data) && $data['*only*'] && strpos($path, $data['*only*']) === false)
+				{
+					continue;	// wrong path
+				}
+				$props[] = $this->supported_privilege($name, $data, $path);
 			}
 		}
 		return self::mkprop('supported-privilege', $props);
@@ -689,7 +714,7 @@ class groupdav extends HTTP_WebDAV_Server
 		}
 		$props['getetag'] = 'EGw-'.$app.'-wGE';
 
-		if ($handler) $privileges = $handler->current_user_privileges($user) ;
+		if ($handler) $privileges = $handler->current_user_privileges($path.$app.'/', $user) ;
 
 		return $this->add_collection($path.$app.'/', $props, $privileges);
 	}
diff --git a/phpgwapi/inc/class.groupdav_handler.inc.php b/phpgwapi/inc/class.groupdav_handler.inc.php
index 0d29c7a59a..71659f498d 100644
--- a/phpgwapi/inc/class.groupdav_handler.inc.php
+++ b/phpgwapi/inc/class.groupdav_handler.inc.php
@@ -391,33 +391,34 @@ abstract class groupdav_handler
 	 *
 	 * Priviledges are for the collection, not the resources / entries!
 	 *
+	 * @param string $path path of collection
 	 * @param int $user=null owner of the collection, default current user
 	 * @return array with privileges
 	 */
-	public function current_user_privileges($user=null)
+	public function current_user_privileges($path, $user=null)
 	{
 		static $grants;
 		if (is_null($grants))
 		{
 			$grants = $this->acl->get_grants($this->app, $this->app != 'addressbook');
 		}
-		$priviledes = array('read-current-user-privilege-set');
+		$priviledes = array('read-current-user-privilege-set' => 'read-current-user-privilege-set');
 
 		if (!$user || $grants[$user] & EGW_ACL_READ)
 		{
-			$priviledes[] = 'read';
+			$priviledes['read'] = 'read';
 		}
 		if (!$user || $grants[$user] & EGW_ACL_ADD)
 		{
-			$priviledes[] = 'bind';	// PUT for new resources
+			$priviledes['bind'] = 'bind';	// PUT for new resources
 		}
 		if (!$user || $grants[$user] & EGW_ACL_EDIT)
 		{
-			$priviledes[] = 'write-content';	// otherwise iOS calendar does not allow to add events
+			$priviledes['write-content'] = 'write-content';	// otherwise iOS calendar does not allow to add events
 		}
 		if (!$user || $grants[$user] & EGW_ACL_DELETE)
 		{
-			$priviledes[] = 'unbind';	// DELETE
+			$priviledes['unbind'] = 'unbind';	// DELETE
 		}
 		// copy/move of existing resources might require write-properties, thought we do not support an explicit PROPATCH
 		return $priviledes;