Windows Live Domains is an easy way for you to get free "Hotmail" type accounts for a domain you own. You simply visit domains.live.com and follow the instructions. This will eventually open up an Admin Centre that you can use to manage accounts, set-up co-branding, and generate a sign-up module. You authenticate as an administrator for the domain via an existing live id account, and by making a change to DNS for the domain you want to manage (thereby proving you own or manage it)
Since this authentication is tied to an existing live id, this seemed to imply that only...