The easiest way to convert an international money order into cash is to use the recipient's bank to cash it directly or to deposit it into an existing account. About.com compares money orders to checks in terms of their convertibility into cash.
There are several other ways to convert an international money order into cash, according to About.com. The money order can be cashed at a location of the order's issuer, such as a Western Union retail location, post office or a 7-Eleven. The recipient may also cash the money order at a check-cashing outlet though there is generally a fee involved when using this method.