public function MailMoveMailsToOtherFolder($folder_id, $mail_id)
 {
     // $folder_id   : IDType
     // $mail_id     : IDType
     $this->CheckAndSetHeader(__FUNCTION__);
     $reg_args["operation"]["folder_id"] = $folder_id;
     $reg_args["operation"]["mail_id"] = $mail_id;
     $this->encodeString($reg_args);
     $results = parent::MailMoveMailsToOtherFolder($reg_args);
     $this->methodClose();
     return $this->decodeString($results->mail);
 }