--- sieverules.php      2013-04-16 08:49:04.000000000 +0200
+++ sieverules.php.utf8 2013-05-07 15:26:53.714294977 +0200
@@ -2250,7 +2250,7 @@
                $rcmail->render_folder_tree_select($a_mailboxes, $mbox_name, 100, $input_folderlist, false);

                $show_customfolder = 'display: none;';
-               if ($rcmail->config->get('sieverules_fileinto_options', 0) == 2 && !$rcmail->storage->folder_exists($folder)) {
+               if ($rcmail->config->get('sieverules_fileinto_options', 0) == 2 && !$rcmail->storage->folder_exists($this->_mbox_encode($folder, $rcmail->config->get('sieverules_folder_encoding'), 1))) {
                        $customfolder = $rcmail->storage->mod_folder($folder);
                        $folder = '@@newfolder';
                        $show_customfolder = '';
@@ -2297,9 +2297,12 @@
                return $str;
        }

-       private function _mbox_encode($text, $encoding)
+       private function _mbox_encode($text, $encoding, $dir=0)
        {
+       if ($dir == 0)
                return rcube_charset::convert($text, 'UTF7-IMAP', $encoding);
+       else
+               return rcube_charset::convert($text, $encoding, 'UTF7-IMAP');
        }

        // get identity record