diff --git a/modules/monitoring/application/controllers/AcknowledgementController.php b/modules/monitoring/application/controllers/AcknowledgementController.php
deleted file mode 100644
index 684111fde..000000000
--- a/modules/monitoring/application/controllers/AcknowledgementController.php
+++ /dev/null
@@ -1,77 +0,0 @@
-<?php
-/* Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
-
-use Icinga\Module\Monitoring\Controller;
-use Icinga\Web\Url;
-use Icinga\Web\Widget\Tabextension\DashboardAction;
-use Icinga\Module\Monitoring\DataView\DataView;
-
-class Monitoring_AcknowledgementController extends Controller
-{
-    /**
-     * Create full report
-     */
-    public function indexAction()
-    {
-        $this->getTabs()->add(
-            'acknowledgement',
-            array(
-                'title' => $this->translate(
-                    'Show acknowledgements'
-                ),
-                'label' => $this->translate('Acknowledgements'),
-                'url'   => Url::fromRequest()
-            )
-        )->extend(new DashboardAction())->activate('acknowledgement');
-        $this->view->title = $this->translate('Acknowledgement');
-        $this->setAutorefreshInterval(15);
-        $query = $this->backend->select()->from(
-            'acknowledgement',
-            array(
-                'acknowledgement_id',
-                'instance_id',
-                'entry_time',
-                'object_id',
-                'state',
-                'author_name',
-                'comment_data',
-                'is_sticky',
-                'persistent_comment',
-                'acknowledgement_id',
-                'notify_contacts',
-                'end_time',
-                'endpoint_object_id',
-                'acknowledgement_is_service',
-                'service',
-                'host'
-            )
-        );
-
-        $this->applyRestriction('monitoring/filter/objects', $query);
-        $this->filterQuery($query);
-        $this->view->acknowledgements = $query;
-
-        $this->setupLimitControl()
-            ->setupPaginationControl($this->view->acknowledgements)
-            ->setupSortControl(array(
-                'entry_time' => $this->translate('Entry Time'),
-                'end_time' => $this->translate('End Time'),
-                'state' => $this->translate('Object State'),
-                'author_name' => $this->translate('Author Name')
-            ), $this->view->acknowledgements);
-    }
-
-    /**
-     * Apply filters on a DataView
-     *
-     * @param DataView  $dataView       The DataView to apply filters on
-     *
-     * @return DataView $dataView
-     */
-    protected function filterQuery(DataView $dataView)
-    {
-        $this->setupFilterControl($dataView);
-        $this->handleFormatRequest($dataView);
-        return $dataView;
-    }
-}
diff --git a/modules/monitoring/application/views/scripts/acknowledgement/index.phtml b/modules/monitoring/application/views/scripts/acknowledgement/index.phtml
deleted file mode 100644
index 728b83f5b..000000000
--- a/modules/monitoring/application/views/scripts/acknowledgement/index.phtml
+++ /dev/null
@@ -1,104 +0,0 @@
-<?php
-use Icinga\Module\Monitoring\Object\Service;
-use Icinga\Module\Monitoring\Object\Host;
-?>
-
-<?php if (! $this->compact): ?>
-<div class="controls">
-  <?= $this->tabs; ?>
-  <div class="dontprint">
-     <?= $this->render('list/components/selectioninfo.phtml'); ?>
-  </div>
-    <h1><?= count($acknowledgements) ?> <?= $this->translate('Acknowledgements') ?></h1>
-    <?= $this->sortBox; ?>
-    <?= $this->limiter; ?>
-    <?= $this->paginator; ?>
-    <?= $this->filterEditor; ?>
-</div>
-<?php endif ?>
-<div class="content">
-  <table data-base-target="_next" class="action">
-    <tbody>
-    <?php foreach ($acknowledgements as $acknowledgement): ?>
-      <?php
-            $state = $acknowledgement->acknowledgement_is_service ?
-                Service::getStateText($acknowledgement->state) : Host::getStateText($acknowledgement->state);
-      ?>
-      <tr class="state handled <?= $state ?>" >
-        <td class="state" style="width: 10em;">
-          <?= $this->icon('ok') ?>
-          <?= $this->timeAgo($acknowledgement->entry_time, $this->compact); ?>
-          <br>
-          <?= sprintf($this->translate(
-              'State was %s.',
-              'Describes the past host or service state when an acknowledgement was set.'
-          ), $state) ?>
-        </td>
-
-        <td>
-          <?php if ($acknowledgement->acknowledgement_is_service): ?>
-            <?= $this->icon('service', $this->translate('Service Acknowledgement')) ?>
-              <?= $this->qlink(
-                $this->escape($acknowledgement->host) . ': ' . $this->escape($acknowledgement->service),
-                'monitoring/service/show',
-                array(
-                    'service' => $acknowledgement->service,
-                    'host' => $acknowledgement->host
-                ),
-                array(
-                    'title' => sprintf(
-                        $this->translate(
-                            'Show detailed information for this acknowledgement about service %s on host %s'
-                        ),
-                        $acknowledgement->service,
-                        $acknowledgement->host
-                    ),
-                    'class' => 'rowaction'
-                )
-              ); ?>
-          <?php else: ?>
-            <?= $this->icon('host', $this->translate('Host Acknowledgement')) ?>
-            <?= $this->qlink(
-                $this->escape($acknowledgement->host),
-                'monitoring/host/show',
-                array(
-                    'host' => $acknowledgement->host
-                ),
-                array(
-                    'title' => sprintf(
-                        $this->translate('Show detailed information for this acknowledgement on host %s'),
-                        $acknowledgement->host
-                    ),
-                    'class' => 'rowaction'
-                )
-            ); ?>
-          <?php endif; ?>
-
-          <br>
-          <?= $this->icon('comment_data', $this->translate('Comment')); ?>
-          <?= isset($acknowledgement->author_name) ? '[' . $this->escape($acknowledgement->author_name) . '] ' : ''; ?>
-          <strong><?= $this->escape($acknowledgement->comment_data); ?></strong>
-
-          <br>
-          <?= $acknowledgement->is_sticky ? $this->icon(
-                'attach',
-                 $this->translate('Sticky, all notifications are disabled until the host or services recovers'
-              )) : ''; ?>
-          <?= $acknowledgement->notify_contacts ? $this->icon(
-                'bell',
-                $this->translate('Contacts are being notified about this acknowledgement.'
-              )) : ''; ?>
-          <?= $acknowledgement->end_time ? sprintf(
-              $this->translate('Expires %s.'),
-              '<strong>' . $this->timeUntil($acknowledgement->end_time) . '</strong>'
-          ) : $this->translate('Does not expire.'); ?>
-        </td>
-      </tr>
-    <?php endforeach ?>
-    </tbody>
-  </table>
-
-  <?php if (! count($acknowledgements)): ?>
-    <?= $this->translate('No comments found matching the filter'); ?>
-   <?php endif ?>
-</div>
diff --git a/modules/monitoring/configuration.php b/modules/monitoring/configuration.php
index 6172fa39f..c68ef6522 100644
--- a/modules/monitoring/configuration.php
+++ b/modules/monitoring/configuration.php
@@ -180,10 +180,6 @@ $section->add($this->translate('Downtimes'), array(
     'url'      => 'monitoring/list/downtimes',
     'priority' => 80
 ));
-$section->add($this->translate('Acknowledgements'), array(
-    'url'      => 'monitoring/acknowledgement',
-    'priority' => 90
-));
 
 /*
  * History Section
diff --git a/modules/monitoring/library/Monitoring/Backend/Ido/Query/AcknowledgementQuery.php b/modules/monitoring/library/Monitoring/Backend/Ido/Query/AcknowledgementQuery.php
deleted file mode 100644
index ac46fd36a..000000000
--- a/modules/monitoring/library/Monitoring/Backend/Ido/Query/AcknowledgementQuery.php
+++ /dev/null
@@ -1,80 +0,0 @@
-<?php
-/* Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
-
-namespace Icinga\Module\Monitoring\Backend\Ido\Query;
-
-use Zend_Db_Select;
-
-/**
- * Query for active acknowledgements
- */
-class AcknowledgementQuery extends IdoQuery
-{
-    /**
-     * {@inheritdoc}
-     */
-    protected $columnMap = array(
-        'acknowledgements' => array(
-            'acknowledgement_id'   => 'a.acknowledgement_id',
-            'instance_id'          => 'a.instance_id',
-            'entry_time'           => 'UNIX_TIMESTAMP(a.entry_time)',
-            'object_id'            => 'a.object_id',
-            'state'                => 'a.state',
-            'author_name'          => 'a.author_name',
-            'comment_data'         => 'a.comment_data',
-            'is_sticky'            => 'a.is_sticky',
-            'persistent_comment'   => 'a.persistent_comment',
-            'acknowledgement_id'   => 'a.acknowledgement_id',
-            'notify_contacts'      => 'a.notify_contacts',
-            'end_time'             => 'UNIX_TIMESTAMP(a.end_time)',
-            'endpoint_object_id'   => 'a.endpoint_object_id'
-        ),
-        'objects' => array(
-            'acknowledgement_is_service' => '(CASE WHEN o.objecttype_id = 2 THEN 1 ELSE 0 END)',
-            'host'                       => 'o.name1',
-            'service'                    => 'o.name2'
-        )
-    );
-
-    /**
-     * @var Zend_Db_Select
-     */
-    protected $acknowledgementQuery;
-
-    /**
-     * {@inheritdoc}
-     */
-    protected function joinBaseTables()
-    {
-        $this->acknowledgementQuery = $this->db->select();
-        $this->select->from(
-            array('o' => $this->prefix . 'objects'),
-            array()
-        );
-        $this->select->joinLeft(
-            array('hs' => $this->prefix . 'hoststatus'),
-            'hs.host_object_id = o.object_id AND o.is_active = 1',
-            array()
-        );
-        $this->select->joinLeft(
-            array('ss' => $this->prefix . 'servicestatus'),
-            'ss.service_object_id = o.object_id AND o.is_active = 1',
-            array()
-        );
-        $ackTable = $this->prefix . 'acknowledgements';
-        $subQuery = '(SELECT MAX(acknowledgement_id) FROM ' . $ackTable . ' WHERE object_id = a.object_id)';
-        $this->select->join(
-            array('a' => $ackTable),
-            'o.object_id = a.object_id ' .
-            'AND ((o.objecttype_id = 2 AND ss.problem_has_been_acknowledged = 1 AND ss.acknowledgement_type = 2) ' .
-            '  OR (o.objecttype_id = 1 AND hs.problem_has_been_acknowledged = 1 AND hs.acknowledgement_type = 2)) ' .
-            'AND o.is_active = 1 AND a.acknowledgement_id = ' . $subQuery,
-            array()
-        );
-
-        $this->joinedVirtualTables['objects'] = true;
-        $this->joinedVirtualTables['acknowledgements'] = true;
-        $this->joinedVirtualTables['hoststatus'] = true;
-        $this->joinedVirtualTables['servicestatus'] = true;
-    }
-}
diff --git a/modules/monitoring/library/Monitoring/DataView/Acknowledgement.php b/modules/monitoring/library/Monitoring/DataView/Acknowledgement.php
deleted file mode 100644
index fb3bb85df..000000000
--- a/modules/monitoring/library/Monitoring/DataView/Acknowledgement.php
+++ /dev/null
@@ -1,52 +0,0 @@
-<?php
-/* Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
-
-namespace Icinga\Module\Monitoring\DataView;
-
-/**
- * Host and service comments view
- */
-class Acknowledgement extends DataView
-{
-    /**
-     * {@inheritdoc}
-     */
-    public function getColumns()
-    {
-        return array(
-            'acknowledgement_id',
-            'instance_id',
-            'entry_time',
-            'object_id',
-            'state',
-            'author_name',
-            'comment_data',
-            'is_sticky',
-            'persistent_comment',
-            'acknowledgement_id',
-            'notify_contacts',
-            'end_time',
-            'acknowledgement_is_service'
-        );
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function getStaticFilterColumns()
-    {
-        return array(
-            'acknowledgement_id',
-            'entry_time',
-            'state',
-            'author_name',
-            'comment_data',
-            'is_sticky',
-            'persistent_comment',
-            'acknowledgement_id',
-            'notify_contacts',
-            'entry_time',
-            'acknowledgement_is_service'
-        );
-    }
-}