diff --git a/include/api.php b/include/api.php
index c60575638a..fdaf50e661 100644
--- a/include/api.php
+++ b/include/api.php
@@ -3668,12 +3668,11 @@
 
 
 	/**
-	 * @brief return direct_messages for Windows 10 App (similar to direct_messages/all, but seen 
-	 * and parent-uri added to output
+	 * @brief return direct_messages (similar to direct_messages/all, but additional 
+	 * error string returned if no mails available to react in client with notification)
 	 *
-	 * @param App $a
 	 * @param string $type Known types are 'atom', 'rss', 'xml' and 'json'
-	 * @return string
+	 * @return string (error -> No Mails available, success -> return messages)
 	 */
 	function api_friendica_direct_messages_all($type){
 		$a = get_app();
@@ -3744,25 +3743,24 @@
 		}
 
 
-		$data = array('$messages' => $ret);
+		$data = array('direct-messages' => $ret);
 		switch($type){
 			case "atom":
 			case "rss":
 				$data = api_rss_extra($a, $data, $user_info);
 		}
 
-		return  api_format_data("direct_messages_all", $type, $data);
+		return  api_format_data("direct-messages", $type, $data);
 
 	}
 	api_register_func('api/friendica/direct_messages_all', 'api_friendica_direct_messages_all', true);
 
 
 	/**
-	 * @brief update a direct_message to seen state for Windows 10 App 
+	 * @brief update a direct_message to seen state
 	 *
-	 * @param App $a
 	 * @param string $type Known types are 'atom', 'rss', 'xml' and 'json'
-	 * @return string
+	 * @return string (success result=ok, error result=error with error message)
 	 */
 	function api_friendica_direct_messages_setseen($type){
 		$a = get_app();
@@ -3809,9 +3807,8 @@
 	/**
 	 * @brief delete a direct_message from mail table through api
 	 *
-	 * @param App $a
 	 * @param string $type Known types are 'atom', 'rss', 'xml' and 'json'
-	 * @return string
+	 * @return string (success result=ok, error result=error with error message)
 	 */
 	function api_friendica_direct_messages_delete($type){
 		$a = get_app();
@@ -3862,9 +3859,10 @@
 	/**
 	 * @brief search for direct_messages containing a searchstring through api
 	 *
-	 * @param App $a
 	 * @param string $type Known types are 'atom', 'rss', 'xml' and 'json'
-	 * @return string
+	 * @return string (success: success=true if found and search_result contains found messages
+	 *                          success=false if nothing was found, search_result='nothing found',
+	 * 		   error: result=error with error message)
 	 */
 	function api_friendica_direct_messages_search($type){
 		$a = get_app();
@@ -3913,90 +3911,6 @@
 	api_register_func('api/friendica/direct_messages_search', 'api_friendica_direct_messages_search', true);
 
 
-	/**
-	 * @brief returns all messages for a specified parenturi, similar to api/direct_messages/conversation but enhanced to return parenturi and seen state
-	 *
-	 * @param App $a
-	 * @param string $type Known types are 'atom', 'rss', 'xml' and 'json'
-	 * @return string
-	 */
-	function api_friendica_direct_messages_conversation($type) {
-		$a = get_app();
-		if (api_user()===false) return false;
-
-		// params
-		$count = (x($_GET,'count')?$_GET['count']:20);
-		$page = (x($_REQUEST,'page')?$_REQUEST['page']-1:0);
-		if ($page<0) $page=0;
-
-		$since_id = (x($_REQUEST,'since_id')?$_REQUEST['since_id']:0);
-		$max_id = (x($_REQUEST,'max_id')?$_REQUEST['max_id']:0);
-
-		$user_id = (x($_REQUEST,'user_id')?$_REQUEST['user_id']:"");
-		$screen_name = (x($_REQUEST,'screen_name')?$_REQUEST['screen_name']:"");
-
-		//  caller user info
-		unset($_REQUEST["user_id"]);
-		unset($_GET["user_id"]);
-
-		unset($_REQUEST["screen_name"]);
-		unset($_GET["screen_name"]);
-
-		$user_info = api_get_user($a);
-		$profile_url = $user_info["url"];
-
-
-		// pagination
-		$start = $page*$count;
-
-		$sql_extra = "`mail`.`parent-uri`='".dbesc( $_GET["uri"] )  ."'";
-
-		if ($max_id > 0)
-			$sql_extra .= ' AND `mail`.`id` <= '.intval($max_id);
-
-		if ($user_id !="") {
-			$sql_extra .= ' AND `mail`.`contact-id` = ' . intval($user_id);
-		}
-		elseif($screen_name !=""){
-			$sql_extra .= " AND `contact`.`nick` = '" . dbesc($screen_name). "'";
-		}
-
-		$r = q("SELECT `mail`.*, `contact`.`nurl` AS `contact-url` FROM `mail`,`contact` WHERE `mail`.`contact-id` = `contact`.`id` AND `mail`.`uid`=%d AND $sql_extra AND `mail`.`id` > %d ORDER BY `mail`.`id` DESC LIMIT %d,%d",
-				intval(api_user()),
-				intval($since_id),
-				intval($start),	intval($count)
-		);
-
-
-		$ret = Array();
-		foreach($r as $item) {
-			if ($box == "inbox" || $item['from-url'] != $profile_url){
-				$recipient = $user_info;
-				$sender = api_get_user($a,normalise_link($item['contact-url']));
-			}
-			elseif ($box == "sentbox" || $item['from-url'] == $profile_url){
-				$recipient = api_get_user($a,normalise_link($item['contact-url']));
-				$sender = $user_info;
-
-			}
-			$ret[]=api_format_messages($item, $recipient, $sender);
-		}
-
-
-		$data = array('$messages' => $ret);
-		switch($type){
-			case "atom":
-			case "rss":
-				$data = api_rss_extra($a, $data, $user_info);
-		}
-
-		return  api_format_data("direct_messages", $type, $data);
-
-	}
-
-	api_register_func('api/friendica/direct_messages_conversation','api_friendica_direct_messages_conversation',true);
-
-
 /*
 To.Do:
     [pagename] => api/1.1/statuses/lookup.json