diff --git a/plugins/calendar/calendar.php b/plugins/calendar/calendar.php
index f18c1d75..3a35e1ef 100644
--- a/plugins/calendar/calendar.php
+++ b/plugins/calendar/calendar.php
@@ -849,8 +849,8 @@ class calendar extends rcube_plugin
     if (($event['_notify'] || $event['_decline']) && $action != 'new') {
       $old = $this->driver->get_event($event);
 
-      // load main event when savemode is 'all'
-      if ($event['_savemode'] == 'all' && $old['recurrence_id']) {
+      // load main event if savemode is 'all' or if deleting 'future' events
+      if (($event['_savemode'] == 'all' || ($event['_savemode'] == 'future' && $action == 'remove' && !$event['_decline'])) && $old['recurrence_id']) {
         $old['id'] = $old['recurrence_id'];
         $old = $this->driver->get_event($old);
       }
@@ -926,10 +926,15 @@ class calendar extends rcube_plugin
         }
 
         // send cancellation for the main event
-        if ($event['_savemode'] == 'all')
+        if ($event['_savemode'] == 'all') {
           unset($old['_instance'], $old['recurrence_date'], $old['recurrence_id']);
-        else if ($event['_savemode'] == 'future')
-          $old['thisandfuture'] = true;
+        }
+        // send an update for the main event's recurrence rule instead of a cancellation message
+        else if ($event['_savemode'] == 'future' && $success !== false && $success !== true) {
+          $event['_savemode'] = 'all';  // force event_save_success() to load master event
+          $action = 'edit';
+          $success = true;
+        }
 
         // send iTIP reply that participant has declined the event
         if ($success && $event['_decline']) {
@@ -943,6 +948,10 @@ class calendar extends rcube_plugin
             }
           }
 
+          if ($event['_savemode'] == 'future' && $event['id'] != $old['id']) {
+            $old['thisandfuture'] = true;
+          }
+
           $itip = $this->load_itip();
           $itip->set_sender_email($reply_sender);
           if ($organizer && $itip->send_itip_message($old, 'REPLY', $organizer, 'itipsubjectdeclined', 'itipmailbodydeclined'))
diff --git a/plugins/calendar/calendar_ui.js b/plugins/calendar/calendar_ui.js
index 59e0f4af..6eac13eb 100644
--- a/plugins/calendar/calendar_ui.js
+++ b/plugins/calendar/calendar_ui.js
@@ -2606,9 +2606,9 @@ function rcube_calendar_ui(settings)
       if (event.recurrence) {
         var future_disabled = '', message_label = (action == 'remove' ? 'removerecurringeventwarning' : 'changerecurringeventwarning');
 
-        // disable the 'future' savemode if attendees are involved
-        // reason: no calendaring system supports the thisandfuture range parameter
-        if (action == 'remove' && _has_attendees && is_organizer(event)) {
+        // disable the 'future' savemode if I'm an attendee
+        // reason: no calendaring system supports the thisandfuture range parameter in iTip REPLY
+        if (action == 'remove' && _has_attendees && !_is_organizer && is_attendee(event)) {
           future_disabled = ' disabled';
         }
 
diff --git a/plugins/calendar/drivers/kolab/kolab_driver.php b/plugins/calendar/drivers/kolab/kolab_driver.php
index 410dc7a7..cc08e6b4 100644
--- a/plugins/calendar/drivers/kolab/kolab_driver.php
+++ b/plugins/calendar/drivers/kolab/kolab_driver.php
@@ -748,6 +748,7 @@ class kolab_driver extends calendar_driver
    */
   public function remove_event($event, $force = true)
   {
+    $ret = true;
     $success = false;
     $savemode = $event['_savemode'];
     $decline  = $event['_decline'];
@@ -821,7 +822,9 @@ class kolab_driver extends calendar_driver
           break;
 
         case 'future':
-          if ($master['id'] != $event['id']) {
+          $recurrence_id_format = $master['allday'] ? 'Ymd' : 'Ymd\THis';
+          $master['_instance'] = $master['start']->format($recurrence_id_format);
+          if ($master['_instance'] != $event['_instance']) {
             $_SESSION['calendar_restore_event_data'] = $master;
             
             // set until-date on master event
@@ -844,6 +847,7 @@ class kolab_driver extends calendar_driver
             }
 
             $success = $storage->update_event($master);
+            $ret = $master['uid'];
             break;
           }
 
@@ -875,7 +879,7 @@ class kolab_driver extends calendar_driver
     if ($success && $this->freebusy_trigger)
       $this->rc->output->command('plugin.ping_url', array('action' => 'calendar/push-freebusy', 'source' => $storage->id));
 
-    return $success;
+    return $success ? $ret : false;
   }
 
   /**