public function storageDatabases($storageGroup, $attributes = ['cn', 'distinguishedname', 'displayname'])
    {
        $this->adldap->utilities()->validateNotNull('Storage Group', $storageGroup);

        $this->adldap->utilities()->validateLdapIsBound();

        $filter = '(&(objectCategory=msExchPrivateMDB))';

        $results = $this->connection->search($storageGroup, $filter, $attributes);

        $entries = $this->connection->getEntries($results);

        return $entries;
    }