Microsoft is migrating MSN accounts to Skype. I don't know if Skype will login to MSN servers or not. I have one account in MSN and one in Skype with the same email, and I don't know if I will merge them obligatorily.
I recognize that Skype has plus capabilities, but it's really ugly. If finally, we can't connect with Miranda, I think that will be a massive migration to others protocols for the people that don't like Skype.