diff --git a/calendar/inc/class.calendar_activesync.inc.php b/calendar/inc/class.calendar_activesync.inc.php
index 06fedb3961..f7127bce8d 100644
--- a/calendar/inc/class.calendar_activesync.inc.php
+++ b/calendar/inc/class.calendar_activesync.inc.php
@@ -17,8 +17,8 @@
  */
 if (isset($_SERVER['SCRIPT_FILENAME']) && $_SERVER['SCRIPT_FILENAME'] == __FILE__)
 {
-	interface activesync_plugin_write {};
-	interface activesync_plugin_meeting_requests {};
+	interface activesync_plugin_write {}
+	interface activesync_plugin_meeting_requests {}
 }
 
 /**
@@ -1576,14 +1576,12 @@ END:VTIMEZONE
 	function settings($hook_data)
 	{
 		$cals = array();
-		if (!$hook_data['setup'])
+		if (!$hook_data['setup'] && is_numeric($hook_data['account_id']))
 		{
-			if (!isset($this->calendar)) $this->calendar = new calendar_boupdate();
-
-			foreach ($this->calendar->list_cals() as $entry)
+			foreach (calendar_bo::list_calendars($hook_data['account_id']) as $entry)
 			{
 				$account_id = $entry['grantor'];
-				if ($account_id != $GLOBALS['egw_info']['user']['account_id'])
+				if ($account_id != $hook_data['account_id'])	// skip current user
 				{
 					$cals[$account_id] = $entry['name'];
 				}
diff --git a/calendar/inc/class.calendar_bo.inc.php b/calendar/inc/class.calendar_bo.inc.php
index eb6403d85c..770d3cde1e 100644
--- a/calendar/inc/class.calendar_bo.inc.php
+++ b/calendar/inc/class.calendar_bo.inc.php
@@ -1650,7 +1650,7 @@ class calendar_bo
 	/**
 	 *  This is called only by list_cals().  It was moved here to remove fatal error in php5 beta4
 	 */
-	function _list_cals_add($id,&$users,&$groups)
+	private static function _list_cals_add($id,&$users,&$groups)
 	{
 		$name = common::grab_owner_name($id);
 		if (!($egw_name = $GLOBALS['egw']->accounts->id2name($id)))
@@ -1680,28 +1680,41 @@ class calendar_bo
 	 */
 	function list_cals()
 	{
+		return self::list_calendars($GLOBALS['egw_info']['user']['account_id'], $this->grants);
+	}
+
+	/**
+	 * generate list of user- / group-calendars or a given user
+	 *
+	 * @param int $user account_id of user to generate list for
+	 * @param array $grants=null calendar grants from user, or null to query them from acl class
+	 */
+	public static function list_calendars($user, array $grants=null)
+	{
+		if (is_null($grants)) $grants = $GLOBALS['egw']->acl->get_grants('calendar', true, $user);
+
 		$users = $groups = array();
-		foreach($this->grants as $id => $rights)
+		foreach(array_keys($grants) as $id)
 		{
-			$this->_list_cals_add($id,$users,$groups);
+			self::_list_cals_add($id,$users,$groups);
 		}
-		if (($memberships = $GLOBALS['egw']->accounts->membership($GLOBALS['egw_info']['user']['account_id'])))
+		if (($memberships = $GLOBALS['egw']->accounts->membership($user)))
 		{
 			foreach($memberships as $group_info)
 			{
-				$this->_list_cals_add($group_info['account_id'],$users,$groups);
+				self::_list_cals_add($group_info['account_id'],$users,$groups);
 
-				if ($account_perms = $GLOBALS['egw']->acl->get_ids_for_location($group_info['account_id'],EGW_ACL_READ,'calendar'))
+				if (($account_perms = $GLOBALS['egw']->acl->get_ids_for_location($group_info['account_id'],EGW_ACL_READ,'calendar')))
 				{
 					foreach($account_perms as $id)
 					{
-						$this->_list_cals_add($id,$users,$groups);
+						self::_list_cals_add($id,$users,$groups);
 					}
 				}
 			}
 		}
-		usort($users,array($this,'name_cmp'));
-		usort($groups,array($this,'name_cmp'));
+		usort($users, array(__CLASS__, 'name_cmp'));
+		usort($groups, array(__CLASS__, 'name_cmp'));
 
 		return array_merge($users, $groups);	// users first and then groups, both alphabeticaly
 	}
@@ -1713,7 +1726,7 @@ class calendar_bo
 	 * @param array $b
 	 * @return int
 	 */
-	function name_cmp(array $a, array $b)
+	public static function name_cmp(array $a, array $b)
 	{
 		return strnatcasecmp($a['name'], $b['name']);
 	}
diff --git a/calendar/inc/class.calendar_groupdav.inc.php b/calendar/inc/class.calendar_groupdav.inc.php
index d5b524eae3..0d6089eb16 100644
--- a/calendar/inc/class.calendar_groupdav.inc.php
+++ b/calendar/inc/class.calendar_groupdav.inc.php
@@ -1536,21 +1536,19 @@ class calendar_groupdav extends groupdav_handler
 	 */
 	static function get_settings($hook_data)
 	{
-		$calendars = array();
-		if (!isset($hook_data['setup']))
+		$calendars = array(
+			'A'	=> lang('All'),
+			'G'	=> lang('Primary Group'),
+		);
+		if (!isset($hook_data['setup']) && in_array($hook_data['type'], array('user', 'group')))
 		{
-			$user = $GLOBALS['egw_info']['user']['account_id'];
-			$cal_bo = new calendar_bo();
-			foreach ($cal_bo->list_cals() as $entry)
+			$user = $hook_data['account_id'];
+			foreach (calendar_bo::list_calendars($user) as $entry)
 			{
 				$calendars[$entry['grantor']] = $entry['name'];
 			}
 			unset($calendars[$user]);
 		}
-		$calendars = array(
-			'A'	=> lang('All'),
-			'G'	=> lang('Primary Group'),
-		) + $calendars;
 
 		$settings = array();
 		$settings['calendar-home-set'] = array(
diff --git a/phpgwapi/inc/class.groupdav_principals.inc.php b/phpgwapi/inc/class.groupdav_principals.inc.php
index a526472f74..f8d3484e9f 100644
--- a/phpgwapi/inc/class.groupdav_principals.inc.php
+++ b/phpgwapi/inc/class.groupdav_principals.inc.php
@@ -1233,13 +1233,14 @@ class groupdav_principals extends groupdav_handler
 	/**
 	 * Get all resources (we cache the resources here, to only query them once per request)
 	 *
+	 * @param int $user=null account_if of user, or null for current user
 	 * @return array of array with values for res_id, cat_id and name (no other values1)
 	 */
-	public static function get_resources()
+	public static function get_resources($user=null)
 	{
 		if (!isset(self::$all_resources))
 		{
-			if (!isset(self::$resources)) self::$resources = new resources_bo();
+			if (!isset(self::$resources)) self::$resources = new resources_bo($user);
 
 			self::$all_resources = array();
 			$query = array(
diff --git a/resources/inc/class.bo_acl.inc.php b/resources/inc/class.bo_acl.inc.php
index 03632aeb4e..adcfc65c94 100755
--- a/resources/inc/class.bo_acl.inc.php
+++ b/resources/inc/class.bo_acl.inc.php
@@ -37,15 +37,16 @@ class bo_acl
 	/**
 	 * Constructor
 	 *
+	 * @param int $user=null account_id of user whos rights to return, or null for current user
 	 * @param boolean $session
 	 */
-	function __construct($session=False)
+	function __construct($session=False, $user=null)
 	{
 		define('EGW_ACL_CAT_ADMIN',64);
 		define('EGW_ACL_DIRECT_BOOKING',128);
 		define('EGW_ACL_CALREAD',256);
 
-		$this->egw_cats = new categories('','resources');
+		$this->egw_cats = new categories($user, 'resources');
 		$this->debug = False;
 
 		//all this is only needed when called from uiacl.
diff --git a/resources/inc/class.resources_bo.inc.php b/resources/inc/class.resources_bo.inc.php
index c2ea4a4709..1d10821177 100755
--- a/resources/inc/class.resources_bo.inc.php
+++ b/resources/inc/class.resources_bo.inc.php
@@ -66,10 +66,15 @@ class resources_bo
 		'accessory_of'	=> 'Accessory of'
 	);
 
-	function __construct()
+	/**
+	 * Constructor
+	 *
+	 * @param int $user=null account_id of user to use for acl, default current user
+	 */
+	function __construct($user=null)
 	{
 		$this->so = new resources_so();
-		$this->acl =& CreateObject('resources.bo_acl');
+		$this->acl = CreateObject('resources.bo_acl', $user);
 		$this->cats = $this->acl->egw_cats;
 
 		$this->cal_right_transform = array(
@@ -139,7 +144,7 @@ class resources_bo
 		{
 			$filter['deleted'] = null;
 		}
-		
+
 		if ($query['filter'])
 		{
 			if (($children = $this->acl->get_cats(EGW_ACL_READ,$query['filter'])))
@@ -393,7 +398,7 @@ class resources_bo
 				$this->so->save();
 			}
 		}
-			
+
 		$res_id = $this->so->save($resource);
 
 		// History & notifications