If you use Office 365 for business purposes you might want to link your O365 account directly to your company domain so as to keep all your emails in order. Your user’s email address may look like email@example.com. If you do not have your own domain name and use some public email services like Gmail or Hotmail, Office 365 can give you a customizable subdomain which you will be able to change later. In this case your email address would look like firstname.lastname@example.org. However from the user’s point of view it is much better to set up your own domain name at once and get rid of all the possible headaches related with email migration.
Log in to your Office 365 admin center, click the Domains link in the dashboard and select “Add domain” to enter the setup wizard. Put your domain name and the customized DNS record into the necessary fields and let Office 365 verify your ownership of the domain. after that the wizard will give you step-by-step instructions on how to ass the record at the host site. The instructions may vary depending on what DNS host you have. When you have completed all the steps, get back to Office 365 and select “Okay, I’ve added the record”.
It may take from 1 to 5 hours for your hosting provider to check the changes and switch your email to the domain you set up. Some of the updates may take up to 72 hours to get in place. If you break into the process and just stop it you will always be able to switch back to it at any time and all the progress will be saved. As soon as the process will be completed all of your Office 365 users will have emails at your own domain.
Note that you will have to log out of the system and then log in again with your new email address to be able to work with Office 365 later on.
Once you have completed your Office 365 domain verification make sure you have set up regular O365 backups to increase your cloud security.