diff --git a/calendar/inc/class.calendar_groupdav.inc.php b/calendar/inc/class.calendar_groupdav.inc.php
index f9d85c00e0..2bd9eb6e5b 100644
--- a/calendar/inc/class.calendar_groupdav.inc.php
+++ b/calendar/inc/class.calendar_groupdav.inc.php
@@ -165,7 +165,9 @@ class calendar_groupdav extends groupdav_handler
 		// process REPORT filters or multiget href's
 		if (($id || $options['root']['name'] != 'propfind') && !$this->_report_filters($options,$filter,$id))
 		{
-			return false;
+			// return empty collection, as iCal under iOS 5 had problems with returning "404 Not found" status
+			// when trying to request not supported components, eg. VTODO on a calendar collection
+			return true;
 		}
 		if ($this->debug > 1)
 		{
diff --git a/infolog/inc/class.infolog_groupdav.inc.php b/infolog/inc/class.infolog_groupdav.inc.php
index 265fd4b442..29a8a894fc 100644
--- a/infolog/inc/class.infolog_groupdav.inc.php
+++ b/infolog/inc/class.infolog_groupdav.inc.php
@@ -147,7 +147,9 @@ class infolog_groupdav extends groupdav_handler
 		// process REPORT filters or multiget href's
 		if (($id || $options['root']['name'] != 'propfind') && !$this->_report_filters($options,$filter,$id))
 		{
-			return false;
+			// return empty collection, as iCal under iOS 5 had problems with returning "404 Not found" status
+			// when trying to request not supported components, eg. VTODO on a calendar collection
+			return true;
 		}
 		if ($this->debug > 1)
 		{
@@ -171,6 +173,7 @@ class infolog_groupdav extends groupdav_handler
 
 		// return iterator, calling ourself to return result in chunks
 		$files['files'] = new groupdav_propfind_iterator($this,$path,$filter,$files['files']);
+
 		return true;
 	}