Outlook.com no longer support custom domain management. That means, you cannot create new custom domain email addresses. Then, what will happen to your existing custom domain email address?
Custom Domain Email
12 September 2015 (Last Modified: 5 March 2016)
Update (added on 1 September 2015): Outlook.com no longer supports this service. Do you already have a domain and......
13 March 2014 (Last Modified: 5 March 2016)
How to setup custom domain email address when you already have your own domain name and a hosting with cPanel.
17 December 2013 (Last Modified: 5 March 2016)