diff --git a/plugins/libkolab/lib/kolab_storage_cache.php b/plugins/libkolab/lib/kolab_storage_cache.php
index d56f04d5..eec058d8 100644
--- a/plugins/libkolab/lib/kolab_storage_cache.php
+++ b/plugins/libkolab/lib/kolab_storage_cache.php
@@ -265,8 +265,10 @@ class kolab_storage_cache
 
             // fetch from IMAP if not present in cache
             if (empty($this->objects[$msguid])) {
-                $result = $this->_fetch(array($msguid), $type, $foldername);
-                $this->objects = array($msguid => $result[0]);  // store only this object in memory (#2827)
+                if ($object = $this->folder->read_object($msguid, $type ?: '*', $foldername)) {
+                    $this->objects = array($msguid => $object);
+                    $this->set($msguid, $object);
+                }
             }
         }
 
diff --git a/plugins/libkolab/lib/kolab_storage_cache_configuration.php b/plugins/libkolab/lib/kolab_storage_cache_configuration.php
index ec015dd7..c3c7ac4f 100644
--- a/plugins/libkolab/lib/kolab_storage_cache_configuration.php
+++ b/plugins/libkolab/lib/kolab_storage_cache_configuration.php
@@ -38,6 +38,28 @@ class kolab_storage_cache_configuration extends kolab_storage_cache
         return $sql_data;
     }
 
+    /**
+     * Select Kolab objects filtered by the given query
+     *
+     * @param array Pseudo-SQL query as list of filter parameter triplets
+     * @param boolean Set true to only return UIDs instead of complete objects
+     * @return array List of Kolab data objects (each represented as hash array) or UIDs
+     */
+    public function select($query = array(), $uids = false)
+    {
+        // modify query for IMAP search: query param 'type' is actually a subtype
+        if (!$this->ready) {
+            foreach ($query as $i => $tuple) {
+                if ($tuple[0] == 'type') {
+                    $tuple[2] = 'configuration.' . $tuple[2];
+                    $query[$i] = $tuple;
+                }
+            }
+        }
+
+        return parent::select($query, $uids);
+    }
+
     /**
      * Helper method to compose a valid SQL query from pseudo filter triplets
      */
diff --git a/plugins/libkolab/lib/kolab_storage_config.php b/plugins/libkolab/lib/kolab_storage_config.php
index 9bc5d509..8a0fab5c 100644
--- a/plugins/libkolab/lib/kolab_storage_config.php
+++ b/plugins/libkolab/lib/kolab_storage_config.php
@@ -125,6 +125,7 @@ class kolab_storage_config
             }
 
             foreach ($folder->select($filter) as $object) {
+                unset($object['_formatobj']);
                 $list[] = $object;
             }
         }
@@ -626,20 +627,24 @@ class kolab_storage_config
             // use faster method
             if ($uid && $uid != '*') {
                 $filter[] = array('member', '=', $uid);
-                return $this->get_objects($filter, $default);
+                $tags = $this->get_objects($filter, $default);
             }
-
-            $this->tags = $this->get_objects($filter, $default);
+            else {
+                $this->tags = $tags = $this->get_objects($filter, $default);
+            }
+        }
+        else {
+            $tags = $this->tags;
         }
 
         if ($uid === '*') {
-            return $this->tags;
+            return $tags;
         }
 
         $result = array();
         $search = self::build_member_url($uid);
 
-        foreach ($this->tags as $tag) {
+        foreach ($tags as $tag) {
             if (in_array($search, (array) $tag['members'])) {
                 $result[] = $tag;
             }