When you set up Office 365, DNS records are required so that email, instant messaging, and other services work correctly. Depending on the Office 365 subscription you signed up for (Enterprise, Midsize Business, or Small Business), you might have a choice between managing your own DNS records at your DNS hosting provider (called partial redelegation), and having Office 365 create and manage the DNS records for your domain (called full redelegation).

When you manage your DNS records, you edit them at your DNS hosting provider. When Office 365 manages your DNS records, after you change your name server records, the other records are stored in Office 365.

You can read more here:

Published: 9/26/2014 18:15