Most organizations prefer to use one or more of the domains they own so that their email addresses end in their own domain ...

Most organizations prefer to use one or more of the domains they own so that their email addresses end in their own domain name (like [email protected]) instead of the default onmicrosoft.com. To use your own domain, you need to verify that you own it with %BRAND_OFFICE_365_SHORT%. We recommend that you add and verify your domains now so that they're ready to go whenever you set up %BRAND_OFFICE_365_SHORT% services, like email and %BRAND_SKYPE_FOR_BUSINESS%.