diff --git a/calendar/inc/class.uical.inc.php b/calendar/inc/class.uical.inc.php
index a4c41274c9..3120ca937e 100644
--- a/calendar/inc/class.uical.inc.php
+++ b/calendar/inc/class.uical.inc.php
@@ -150,25 +150,66 @@ class uical
 	}
 	
 	/**
-	 * Checks and terminates with a message if $this->owner include a user/resource we have no read-access to
+	 * Checks and terminates (or returns for home) with a message if $this->owner include a user/resource we have no read-access to
+	 *
+	 * If currentapp == 'home' we return the error instead of terminating with it !!!
+	 *
+	 * @return boolean/string false if there's no error or string with error-message
 	 */
 	function check_owners_access()
 	{
-		$no_access = array();
+		$no_access = $no_access_group = array();
 		foreach(explode(',',$this->owner) as $owner)
 		{
-			if (!$this->bo->check_perms(EGW_ACL_READ,0,$owner))
+			if (is_numeric($owner) && $GLOBALS['egw']->accounts->get_type($owner) == 'g')
+			{
+				foreach($GLOBALS['egw']->accounts->member($owner) as $member)
+				{
+					$member = $member['account_id'];
+					if (!$this->bo->check_perms(EGW_ACL_READ,0,$member))
+					{
+						$no_access_group[$member] = $this->bo->participant_name($member);
+					} 
+				}
+			}
+			elseif (!$this->bo->check_perms(EGW_ACL_READ,0,$owner))
 			{
 				$no_access[$owner] = $this->bo->participant_name($owner);
 			}
 		}
 		if (count($no_access))
 		{
+			$msg = '<p class="redItalic" align="center">'.lang('Access denied to the calendar of %1 !!!',implode(', ',$no_access))."</p>\n";
+		
+			if ($GLOBALS['egw_info']['flags']['currentapp'] == 'home')
+			{
+				return $msg;
+			}
 			$GLOBALS['egw']->common->egw_header();
-			echo '<p class="redItalic" align="center">'.lang('Access denied to the calendar of %1 !!!',implode(', ',$no_access))."</p>\n";
+			if ($GLOBALS['egw_info']['flags']['nonavbar']) parse_navbar();
+
+			echo $msg;
+
 			$GLOBALS['egw']->common->egw_footer();
 			$GLOBALS['egw']->common->egw_exit();
 		}
+		if (count($no_access_group))
+		{
+			$this->group_warning = lang('Groupmember(s) %1 not included, because you have no access.',implode(', ',$no_access_group));
+		}
+		return false;
+	}
+	
+	/**
+	 * show the egw-framework plus possible messages ($_GET['msg'] and $this->group_warning from check_owner_access)
+	 */
+	function do_header()
+	{
+		$GLOBALS['egw']->common->egw_header();
+		
+		if ($_GET['msg']) echo '<p class="redItalic" align="center">'.$this->html->htmlspecialchars($_GET['msg'])."</p>\n";
+
+		if ($this->group_warning) echo '<p class="redItalic" align="center">'.$this->group_warning."</p>\n";
 	}
 
 	/**
diff --git a/calendar/inc/class.uilist.inc.php b/calendar/inc/class.uilist.inc.php
index b863856ed7..760d20cc99 100644
--- a/calendar/inc/class.uilist.inc.php
+++ b/calendar/inc/class.uilist.inc.php
@@ -89,7 +89,8 @@ class uilist extends uical
 	 */
 	function listview($content=null,$msg='',$home=false)
 	{
-		if ($_GET['msg']) $msg = $_GET['msg'];
+		if ($_GET['msg']) $msg .= $_GET['msg'];
+		if ($this->group_warning) $msg .= $this->group_warning;
 
 		$etpl =& CreateObject('etemplate.etemplate','calendar.list');
 
diff --git a/calendar/inc/class.uiviews.inc.php b/calendar/inc/class.uiviews.inc.php
index 54a6dcb26b..c735caebdb 100644
--- a/calendar/inc/class.uiviews.inc.php
+++ b/calendar/inc/class.uiviews.inc.php
@@ -131,22 +131,31 @@ class uiviews extends uical
 			'multiple'   => 0,
 			'view'       => $this->bo->cal_prefs['defaultcalendar'],			
 		));
+		
+		if (($error = $this->check_owners_access()))
+		{
+			return $error;
+		}
+		if ($this->group_warning)
+		{
+			$group_warning = '<p class="redItalic" align="center">'.$this->group_warning."</p>\n";
+		}
 		switch($this->cal_prefs['defaultcalendar'])
 		{
 			case 'planner_user':
 			case 'planner_cat':
 			case 'planner':
-				return $this->planner(true);
+				return $group_warning.$this->planner(true);
 
 			case 'month':
-				return $this->month(0,true);
+				return $group_warning.$this->month(0,true);
 
 			default:
 			case 'week':
-				return $this->week(0,true);
+				return $group_warning.$this->week(0,true);
 				
 			case 'day':
-				return $this->day(true);
+				return $group_warning.$this->day(true);
 		}
 	}
 	
@@ -205,8 +214,7 @@ class uiviews extends uical
 
 		if (!$home)
 		{
-			$GLOBALS['egw']->common->egw_header();
-			if ($_GET['msg']) echo '<p class="redItalic" align="center">'.$this->html->htmlspecialchars($_GET['msg'])."</p>\n";
+			$this->do_header();
 		
 			echo $content;
 		}
@@ -262,8 +270,7 @@ class uiviews extends uical
 		}
 		if (!$home)
 		{
-			$GLOBALS['egw']->common->egw_header();
-			if ($_GET['msg']) echo '<p class="redItalic" align="center">'.$this->html->htmlspecialchars($_GET['msg'])."</p>\n";
+			$this->do_header();
 		
 			echo $content;
 		}
@@ -362,8 +369,7 @@ class uiviews extends uical
 		}
 		if (!$home)
 		{
-			$GLOBALS['egw']->common->egw_header();
-			if ($_GET['msg']) echo '<p class="redItalic" align="center">'.$this->html->htmlspecialchars($_GET['msg'])."</p>\n";
+			$this->do_header();
 			
 			echo $content;
 		}
@@ -386,8 +392,7 @@ class uiviews extends uical
 		
 		if (!$home)
 		{
-			$GLOBALS['egw']->common->egw_header();
-			if ($_GET['msg']) echo '<p class="redItalic" align="center">'.$this->html->htmlspecialchars($_GET['msg'])."</p>\n";
+			$this->do_header();
 	
 			$users = $this->search_params['users'];
 			if (!is_array($users)) $users = array($users);
diff --git a/calendar/setup/phpgw_de.lang b/calendar/setup/phpgw_de.lang
index c649bedc03..c5a7b2cdae 100644
--- a/calendar/setup/phpgw_de.lang
+++ b/calendar/setup/phpgw_de.lang
@@ -126,6 +126,7 @@ global public and group public	calendar	de	Global 
 global public only	calendar	de	nur Global öffentlich
 group planner	calendar	de	Gruppenplaner
 group public only	calendar	de	Gruppen-Öffentlich
+groupmember(s) %1 not included, because you have no access.	calendar	de	Gruppenmitglied(er) %1 nicht enthalten, da Sie keinen Zugriff haben.
 here is your requested alarm.	calendar	de	Hier ist ihr bestellter Alarm.
 high priority	calendar	de	Hohe Priorität
 holiday	calendar	de	Feiertag
diff --git a/calendar/setup/phpgw_en.lang b/calendar/setup/phpgw_en.lang
index 2e59f3e8cc..f630fd3741 100644
--- a/calendar/setup/phpgw_en.lang
+++ b/calendar/setup/phpgw_en.lang
@@ -126,6 +126,7 @@ global public and group public	calendar	en	global public and group public
 global public only	calendar	en	global public only
 group planner	calendar	en	Group planner
 group public only	calendar	en	group public only
+groupmember(s) %1 not included, because you have no access.	calendar	en	Groupmember(s) %1 not included, because you have no access.
 here is your requested alarm.	calendar	en	Here is your requested alarm.
 high priority	calendar	en	high priority
 holiday	calendar	en	Holiday