diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index 0b5cdd1..dc8edc4 100755
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -21,6 +21,8 @@ use Modules\Tasks\Models\AccountRelationMapper;
 use Modules\Tasks\Models\PermissionCategory;
 use Modules\Tasks\Models\TaskElementMapper;
 use Modules\Tasks\Models\TaskMapper;
+use Modules\Tasks\Models\TaskSeen;
+use Modules\Tasks\Models\TaskSeenMapper;
 use Modules\Tasks\Models\TaskStatus;
 use Modules\Tasks\Views\TaskView;
 use phpOMS\Account\PermissionType;
@@ -110,6 +112,23 @@ final class BackendController extends Controller implements DashboardElementInte
 
         $view->data['open'] = $open;
 
+        /** @var \Modules\Tasks\Models\TaskSeen[] $unread */
+        $unread = TaskSeenMapper::getAll()
+            ->where('task', \array_keys($open), 'in')
+            ->where('seenBy', $request->header->account)
+            ->execute();
+
+        $unseen = [];
+        foreach ($unread as $read) {
+            if ($read->isRemindered && ($read->reminderAt?->getTimestamp() ?? 0) > $request->header->getRequestTime()) {
+                continue;
+            }
+
+            $unseen[$read->task] = true;
+        }
+
+        $view->data['unread'] = $unseen;
+
         return $view;
     }
 
@@ -196,6 +215,31 @@ final class BackendController extends Controller implements DashboardElementInte
             ->where('tags/title/language', $request->header->l11n->language)
             ->execute();
 
+        if ($task !== 0) {
+            $taskSeen = TaskSeenMapper::getAll()
+                ->where('task', (int) $request->getData('id'))
+                ->where('seenBy', $request->header->account)
+                ->execute();
+
+            foreach ($taskSeen as $unseen) {
+                if ($unseen->isRemindered && ($unseen->reminderAt?->getTimestamp() ?? 0) < $request->header->getRequestTime()) {
+                    $old = clone $unseen;
+
+                    $unseen->isRemindered = false;
+
+                    $this->updateModel($request->header->account, $old, $unseen, TaskSeenMapper::class, 'task-seen', $request->getOrigin());
+                }
+            }
+
+            if (empty($taskSeen)) {
+                $taskSeen = new TaskSeen();
+                $taskSeen->seenBy = $request->header->account;
+                $taskSeen->task = (int) $request->getData('id');
+
+                $this->createModel($request->header->account, $taskSeen, TaskSeenMapper::class, 'task-seen', $request->getOrigin());
+            }
+        }
+
         $accountId = $request->header->account;
 
         if (!($task->createdBy->id === $accountId
diff --git a/Models/NullTaskSeen.php b/Models/NullTaskSeen.php
new file mode 100644
index 0000000..b6dbbfd
--- /dev/null
+++ b/Models/NullTaskSeen.php
@@ -0,0 +1,47 @@
+<?php
+/**
+ * Jingga
+ *
+ * PHP Version 8.1
+ *
+ * @package   Modules\Tasks\Models
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 2.0
+ * @version   1.0.0
+ * @link      https://jingga.app
+ */
+declare(strict_types=1);
+
+namespace Modules\Tasks\Models;
+
+/**
+ * Null model
+ *
+ * @package Modules\Tasks\Models
+ * @license OMS License 2.0
+ * @link    https://jingga.app
+ * @since   1.0.0
+ */
+final class NullTaskSeen extends TaskSeen
+{
+    /**
+     * Constructor
+     *
+     * @param int $id Model id
+     *
+     * @since 1.0.0
+     */
+    public function __construct(int $id = 0)
+    {
+        $this->id = $id;
+        parent::__construct();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function jsonSerialize() : mixed
+    {
+        return ['id' => $this->id];
+    }
+}
diff --git a/Theme/Backend/task-dashboard.tpl.php b/Theme/Backend/task-dashboard.tpl.php
index 310fb7b..70d5e9b 100755
--- a/Theme/Backend/task-dashboard.tpl.php
+++ b/Theme/Backend/task-dashboard.tpl.php
@@ -242,6 +242,10 @@ echo $this->data['nav']->render(); ?>
                             <?php
                                 $c = 0;
                                 foreach ($open as $key => $task) : ++$c;
+                                    if (isset($this->data['unread'][$key])) {
+                                        continue;
+                                    }
+
                                     $url = UriFactory::build(empty($task->redirect)
                                         ? 'task/single?{?}&id=' . $task->id
                                         : ('{/app}/' . $task->redirect),