def get_account_cos(self, account):
        """ Fetch the cos for a given account

        Quite different from the original request which returns COS + various
        URL + COS + zimbraMailHost... But all other informations are accessible
        through get_account.

        :type account: zobjects.Account
        :rtype: zobjects.COS
        """
        resp = self.request(
            'GetAccountInfo', {'account': account.to_selector()})
        return zobjects.COS.from_dict(resp['cos'])