diff --git a/plugins/libkolab/lib/kolab_storage_cache.php b/plugins/libkolab/lib/kolab_storage_cache.php
index 6f6e16ea..ef4dd224 100644
--- a/plugins/libkolab/lib/kolab_storage_cache.php
+++ b/plugins/libkolab/lib/kolab_storage_cache.php
@@ -591,6 +591,7 @@ class kolab_storage_cache
         $object['_type'] = $sql_arr['type'];
         $object['_msguid'] = $sql_arr['msguid'];
         $object['_mailbox'] = $this->folder->name;
+        $object['_size'] = strlen($sql_arr['xml']);
         $object['_formatobj'] = kolab_format::factory($sql_arr['type'], 3.0, $sql_arr['xml']);
 
         return $object;
diff --git a/plugins/libkolab/lib/kolab_storage_folder.php b/plugins/libkolab/lib/kolab_storage_folder.php
index 5038a644..1ffb0df1 100644
--- a/plugins/libkolab/lib/kolab_storage_folder.php
+++ b/plugins/libkolab/lib/kolab_storage_folder.php
@@ -51,6 +51,7 @@ class kolab_storage_folder
     private $type_annotation;
     private $imap;
     private $info;
+    private $idata;
     private $owner;
     private $resource_uri;
     private $uid2msg = array();
@@ -99,6 +100,16 @@ class kolab_storage_folder
         return $this->info;
     }
 
+    /**
+     * Make IMAP folder data available for this folder
+     */
+    public function get_imap_data()
+    {
+        if (!isset($this->idata))
+            $this->idata = $this->imap->folder_data($this->name);
+
+        return $this->idata;
+    }
 
     /**
      * Returns IMAP metadata/annotations (GETMETADATA/GETANNOTATION)