Create Office 365{SharePoint Online} External site with an existing domain

Do you posses your own domain name and now you need that hosted as Office 365 site? This can be done with a little effort. You can use a vanity domain (this is what the additional domain is called) a Office 365 public-facing website.

To use your vanity domain for a Professional and Small Business account (P1), please complete the following instructions:

1. Add your vanity domain to the domain section of your Microsoft Online Portal
2. Complete the process of having your vanity domain verified
3. Once the vanity domain is verified, go to your domain registrar
4. At the registrar, change the name servers to ns1.bdm.microsoftonline.com and       ns2.bdm.microsoftonline.com  (This process may take up to 72 hours)
5. After the name servers are changed, go back to the domain section of your Microsoft Online Portal
6. Click on the "change address" option, choose the vanity domain (This process may take up to 24 hours to propagate for you to be able to access your website and for your links in the portal to update to the vanity domain URLs)