How to change onmicrosoft.com domain in Office 365

In this article you will learn how to change onmicrosoft.com domain name in Office 365 tenant.

What is onmicrosoft.com domain

When you sign up for Office 365 subscription, Microsoft provides an initial domain (onmicrosoft.com) for every Office 365 tenant. This initial domain becomes the primary domain associated with your Office 365 account and is used for email addresses, SharePoint sites, and other services within the Office 365 environment.

An initial domain or onmicrosoft.com domain is divided in 2 parts, Tenant Name and onmicrosoft.com. Where Tenant Name is the name of your Office 365 organization that you choose when you set up Office 365 tenant. Every initial domain in Office 365 or Microsoft 365 tenant has .onmicrosoft.com domain suffix.

You can use the initial domain for email addresses (send and receive emails), SharePoint sites, user names (User Principal name (UPN)), and other services.

Can I change onmicrosoft.com domain name

No, you can not change onmicrosoft.com domain name in Office 365 tenant. Once you have set up an Office 365 tenant, you can not rename or change onmicrosoft.com domain name (initial domain name). However you can create a new onmicrosoft.com for your tenant and you can assign it to the email addresses or user names.

Create new onmicrosoft.com domain in Office 365

You can create five onmicrosoft.com domains in an Office 365 tenant. Please follow below steps to create new onmicrosoft.com domain.

Login to Microsoft 365 Admin Center, expand Settings, click Domains, and click your onmicrosoft.com domain as shown below:

Scroll down the page to the bottom and click Add onmicrosoft.com domain (preview).

On the Add an onmicrosoft.com domain (preview) page, type a new name for initial domain as shown below and click Add domain.

Note: Every initial domain is should be a unique name. If the name you are selecting is taken by someone already, you will not be able to use the same name for new onmicrosoft.com domain.

On the next screen you will receive a message that domain has been added and you can see your new onmicrosoft.com domain name. Click Close to close the wizard.

Click Domains again under Settings and you can see the new onmicrosoft.com domain for your Office 365 tenant.

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