diff --git a/lib/kolab_sync_data_email.php b/lib/kolab_sync_data_email.php
--- a/lib/kolab_sync_data_email.php
+++ b/lib/kolab_sync_data_email.php
@@ -464,6 +464,8 @@
             $result['categories'] = $this->getKolabTags($message);
         }
 
+        $is_ios = preg_match('/(iphone|ipad)/i', $this->device->devicetype);
+
         // attachments
         $attachments = array_merge($message->attachments, $message->inline_parts);
         if (!empty($attachments)) {
@@ -472,6 +474,10 @@
             foreach ($attachments as $attachment) {
                 $att = array();
 
+                if ($is_ios && !empty($event) && $attachment->mime_id == $event['_mime_id']) {
+                    continue;
+                }
+
                 $filename = rcube_charset::clean($attachment->filename);
                 if (empty($filename) && $attachment->mimetype == 'text/html') {
                     $filename = 'HTML Part';
@@ -1799,9 +1805,12 @@
         foreach ($ical_objects as $mime_id => $event) {
             if ($event['_type'] == 'event') {
                 $event['_method'] = $ical_objects->method;
+                $event['_mime_id'] = $ical_objects->mime_id;
+
                 return $event;
             }
         }
+
         return null;
     }