Windows Live Admin Center (changed from Windows Live Custom Domains in November 2007) is a service provided by Windows Live. It enables users with domain names to change their domain MX record(s) (mail server records) so that all features of Windows Live Hotmail will be available on their own domain.
One Windows Live ID can be set as the administrator and using that ID accounts can be created, modified or deleted. The administrator may also choose to allow anyone to create his or her own account in the domain via a link on the domain's web site. Administrators can choose from a web-based or Windows-based application to manage all aspects of their domain accounts.
Users with Admin Center accounts can check their emails using Windows Live Hotmail, Windows Live Mail, and Outlook.