Setting up Outlook mail service on a custom web domain
Step 1).
Logging in to Windows Live Admin Centre
Go to this URL domains.live.com to access Windows Live Admin Centre.
To access the Domain section, you will have to log in using your Windows Live/Outlook/Hotmail ID
Step 2).
Adding Domain
Once you are logged in the admin, you can either;
i). Manage a domain you have already signed up for or
ii). Sign up a new domain.
Assuming you have not signed up for a new domain, click Add domain.
Enter your domain name or buy one from Microsoft Partners

Step 3:
Proving Ownership of Domain
You are prompted to create an MX record through your domain registrar

After proving the domain ownership, click MEMBER ACCOUNTS to start creating new customized email addresses

Enter the user name. You don’t necessarily have to enter your first and last name

Now your customized outlook account is active and ready for you to start using