//517tree_view
// folder tree view style
$_prefs['tree_view'] = array(
    'value' => 0,
    'locked' => false,
    'shared' => false,
    'type' => 'enum', 
    'enum' => array(0 => _("Combine all namespaces"),
                    1 => _("Show non-private mailboxes in separate folders")),
    'desc' => _("How should namespaces be displayed in the folder tree view?")
);

