Add your domain to Office 365

If you want your hosted email or other services to use a domain that you own rather than the one you were given at signup, you can add the domain to Microsoft Office 365 for professionals and small businesses.

Here’s how:

• Add the domain name to Office 365.
  
• Verify that the domain name belongs to you. To do this, add a DNS record at your domain registrar site, wait for the information to propagate through the DNS system, and then request that Office 365 verify that the record is there.
  
• Update your DNS name server records to point DNS traffic for your domain to Office 365. After the update is propagated through the DNS system, you can use your Office 365 services with your domain name.
  

  Note:
  Office 365 hosts your DNS after you add your domain so the required DNS records for your Office 365 services (Microsoft Exchange Online, SharePoint Online, and Lync Online) are configured for you. To learn more about DNS, see DNS basics and Work with domain names and DNS records in Office 365.

Specific instructions vary depending on what you want to do. Office 365 doesn’t provide a custom domain for you, but you can easily purchase one yourself. (How? See Buy a domain name.)

Note:
You can add multiple domains to Office 365. However, you can’t add the same domain to different Office 365 accounts. So, for example, when you add your domain to Office 365, you can't create another Office 365 account and add the same domain name to that account.