diff --git a/plugins/calendar/calendar_ui.js b/plugins/calendar/calendar_ui.js
--- a/plugins/calendar/calendar_ui.js
+++ b/plugins/calendar/calendar_ui.js
@@ -783,6 +783,8 @@
         $('#edit-identities-list').val(identity_id);
         $('#edit-attendees-form')[(allow_invitations?'show':'hide')]();
         $('#edit-attendee-schedule')[(calendar.freebusy?'show':'hide')]();
+        $('#event-panel-attendees #edit-attendees-legend')[(calendar.freebusy?'show':'hide')]();
+        $('#edit-attendees-table th.availability')[(calendar.freebusy?'show':'hide')]();
       };
 
       // attachments
@@ -1955,7 +1957,7 @@
       var avail_tag = elastic ? ('<span class="' + avail + '"') : ('<img alt="" src="' + img_src + '" class="availabilityicon '  + avail + '"');
       var html = '<td class="role">' + select + '</td>' +
         '<td class="name"><span class="attendee-name">' + dispname + '</span></td>' +
-        '<td class="availability">' + avail_tag + ' data-email="' + data.email + '" /></td>' +
+        (calendar.freebusy ? '<td class="availability">' + avail_tag + ' data-email="' + data.email + '" /></td>' : '') +
         '<td class="confirmstate"><span class="attendee ' + (status || 'organizer') + '" title="' + Q(tooltip) + '">' + Q(status && !elastic ? status_label : '') + '</span></td>' +
         (data.cutype != 'RESOURCE' ? '<td class="invite">' + (organizer || readonly || !invbox ? '' : invbox) + '</td>' : '') +
         '<td class="options">' + (organizer || readonly ? '' : dellink) + '</td>';
diff --git a/plugins/calendar/drivers/caldav/caldav_driver.php b/plugins/calendar/drivers/caldav/caldav_driver.php
--- a/plugins/calendar/drivers/caldav/caldav_driver.php
+++ b/plugins/calendar/drivers/caldav/caldav_driver.php
@@ -58,6 +58,10 @@
 
         // $this->freebusy_trigger = $this->rc->config->get('calendar_freebusy_trigger', false);
 
+        if (!$this->rc->config->get('kolab_freebusy_server', false)) {
+            $this->freebusy = false;
+        }
+
         // TODO: get configuration for the Bonnie API
         // $this->bonnie_api = libkolab::get_bonnie_api();
     }
diff --git a/plugins/calendar/drivers/kolab/kolab_driver.php b/plugins/calendar/drivers/kolab/kolab_driver.php
--- a/plugins/calendar/drivers/kolab/kolab_driver.php
+++ b/plugins/calendar/drivers/kolab/kolab_driver.php
@@ -66,6 +66,10 @@
 
         $this->freebusy_trigger = $this->rc->config->get('calendar_freebusy_trigger', false);
 
+        if (!$this->rc->config->get('kolab_freebusy_server', false)) {
+            $this->freebusy = false;
+        }
+
         if (kolab_storage::$version == '2.0') {
             $this->alarm_types    = ['DISPLAY'];
             $this->alarm_absolute = false;