def checkUser(self, user):
        """
        Query a username or email address to see if a corresponding Microsoft account exists.

        Args:
            user (str): username or email address of an account

        Returns:
            bool: whether the account exists
        """
        return not self.conn("POST", "{0}/GetCredentialType.srf".format(SkypeConnection.API_MSACC),
                             json={"username": user}).json().get("IfExistsResult")
Query a username or email address to see if a corresponding Microsoft account exists.

        Args:
            user (str): username or email address of an account

        Returns:
            bool: whether the account exists