diff --git a/infolog/inc/class.infolog_bo.inc.php b/infolog/inc/class.infolog_bo.inc.php
index 10ad1618f1..199e1cfc6f 100644
--- a/infolog/inc/class.infolog_bo.inc.php
+++ b/infolog/inc/class.infolog_bo.inc.php
@@ -1052,6 +1052,32 @@ class infolog_bo
 		return $ret;
 	}
 
+	/**
+	 * Query ctag for infolog
+	 *
+	 * @param string $filter='own'
+	 * @param string|array $types='task'
+	 * @return string
+	 */
+	public function getctag(array $filter)
+	{
+		$filter += array(
+			'order'			=> 'info_datemodified',
+			'sort'			=> 'DESC',
+			'date_format'	=> 'server',
+			'start'			=> 0,
+			'num_rows'		=> 1,
+		);
+
+		$result =& $this->search($filter);
+
+		if (empty($result)) return 'EGw-empty-wGE';
+
+		$entry = array_shift($result);
+
+		return 'EGw-'.$entry['info_datemodified'].'-wGE';
+	}
+
 	/**
 	 * imports a mail identified by uid as infolog
 	 *