diff --git a/lib/ext/Syncroton/Command/Options.php b/lib/ext/Syncroton/Command/Options.php
index 52f33ad..61f785c 100644
--- a/lib/ext/Syncroton/Command/Options.php
+++ b/lib/ext/Syncroton/Command/Options.php
@@ -1,34 +1,34 @@
 <?php
 /**
  * Syncroton
  *
  * @package     Syncroton
  * @subpackage  Command
  * @license     http://www.tine20.org/licenses/lgpl.html LGPL Version 3
  * @copyright   Copyright (c) 2008-2012 Metaways Infosystems GmbH (http://www.metaways.de)
  * @author      Lars Kneschke <l.kneschke@metaways.de>
  */
 
 /**
  * class to handle ActiveSync http options request
  *
  * @package     Syncroton
  * @subpackage  Command
  */
 class Syncroton_Command_Options
 {
     /**
      * this function generates the response for the client
      *
      * @return void
      */
     public function getHeaders()
     {
-        // same header like Exchange 2xxx???
         return array(
-            'MS-Server-ActiveSync'  => '14.00.0536.000',
-            'MS-ASProtocolVersions' => '2.5,12.0,12.1,14.0,14.1',
-            'MS-ASProtocolCommands' => 'FolderCreate,FolderDelete,FolderSync,FolderUpdate,GetAttachment,GetItemEstimate,ItemOperations,MeetingResponse,MoveItems,Provision,ResolveRecipients,Ping,SendMail,Search,Settings,SmartForward,SmartReply,Sync,ValidateCert'
+            'MS-Server-ActiveSync'  => '15.1',
+            'MS-ASProtocolVersions' => '2.5,12.0,12.1,14.0,14.1,16.0,16.1',
+            // TODO: Find, ResolveRecipients, ValidateCert
+            'MS-ASProtocolCommands' => 'FolderCreate,FolderDelete,FolderSync,FolderUpdate,GetAttachment,GetItemEstimate,ItemOperations,MeetingResponse,MoveItems,Provision,Ping,SendMail,Search,Settings,SmartForward,SmartReply,Sync'
         );
     }
 }