Finally Microsoft is offering a simliar service to Google’s gmail hosted service. You can sign up every kind of domain you own and use the Microsoft Live Mail Interface for it. Although, you need to have the ability to change the DNS records of the domain. One advantage is that you don’t have to wait for an invitation, your account opens up immediately instead of gmail’s hosted service.
I just signed up one of my domains, as soon as my DNS settings are being upgraded I’ll post some experiences with the Live Mail Interface.