The protocol is private, and they don't provide contact/online info to the world. Other than devoting one of the custom profile fields to say "yes! I do have MSNm!" so people know to add your email, there's not much else that can be done.
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Other than devoting one of the custom profile fields to say "yes! I do have MSNm!" so people know to add your email, there's not much else that can be done. 
