diff --git a/lib/kolab_sync_data.php b/lib/kolab_sync_data.php
--- a/lib/kolab_sync_data.php
+++ b/lib/kolab_sync_data.php
@@ -1491,9 +1491,8 @@
      */
     protected function body_from_kolab($body, $collection)
     {
-        if (empty($body)) {
-            return;
-        }
+        // We deliberately return the element also for an empty body,
+        // as this is required for Outlook on Android to recognize events.
 
         $opts      = $collection->options;
         $prefs     = $opts['bodyPreferences'];