Windows Live Admin Center

Changes to custom domains with Outlook.com

Outlook.com no longer offers support for custom domain management. New customers looking to manage custom domains are encouraged to use Office 365, Microsoft's premium online service, which also includes enterprise-class email, collaboration and communication tools.
If you previously used custom domains with Outlook.com, we still support the ability to log in to Outlook.com with your existing custom domain email address, but admins can no longer manage accounts in the domain. These accounts are still able to send and receive email, and you don’t need to make any changes. To access an account, please log in via Outlook.com.
Domain administrators who wish to continue managing email addresses in their domain should migrate to Office 365. As part of Office 365, you will be able to continue managing your custom domains, as well as use many additional productivity tools including shared calendars, cloud storage and instant messaging.
If you are a WLSPP vendor, you can still sign in as normal: