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How to Change Organization Name and Email Domain in Microsoft 365

Partner Editor Sep 29, 2026 868 views

Question details

The user wants to know how to transition their organization to a new legal name and email domain in Microsoft 365 without disrupting current services or losing accounts.

How to Change Organization Name and Email Domain in Microsoft 365

Product: Microsoft 365
Device & OS: not provided
Scenario: An organization is undergoing a name change and needs to update its Microsoft 365 tenant to reflect the new identity and email domain.
Observed behavior: The user needs a safe transition path to update billing or legal names and email addresses while preserving all existing licenses, users, and cloud data.

Before you start

Ensure you have Global Administrator or Domain Administrator privileges in your Microsoft 365 tenant and have access to the DNS settings of your new domain.

Solution 1Recommended

Update Your Email Domain in the Microsoft 365 Admin Center

Follow these steps to add a new custom domain and assign new email addresses while retaining all user data.

You do not need to create new accounts or purchase new subscriptions. An administrator can simply add a new custom domain, verify it, and seamlessly assign the new addresses to existing users.

Add the new domain

Log into the Microsoft 365 Admin Center. Navigate to Settings > Domains, and click on 'Add domain'. Enter your new organization domain name.

Verify domain ownership

Follow the on-screen prompts to add the required TXT or MX records to your DNS hosting provider. This step proves to Microsoft that you own the domain.

Assign new email addresses

Go to Users > Active users. Select the users whose emails need to be updated, and change their primary email addresses to use the new domain.

Keep the old domain as an alias

Leave the old email addresses attached to the user accounts as aliases. This ensures that any messages sent to their previous addresses are still successfully delivered.

Update Your Email Domain in the Microsoft 365 Admin Center

Re-authentication may be required: Users may need to sign out and sign back into their Microsoft 365 desktop and mobile apps (like Outlook, Word, or Teams) after their primary email address is changed.

Solution 2

Update the Official Legal and Billing Name via Microsoft Support

Updating the official billing or legal entity name of your tenant often requires manual verification.

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microsoft office alternative - wps office

Frequently Asked Questions

Will I lose my existing Microsoft 365 data when changing domains?

No, changing your email domain does not affect your cloud data, OneDrive files, SharePoint sites, or existing licenses. Your tenant and all associated data remain fully intact.

Do I need to purchase new Microsoft 365 subscriptions for the new domain?

No, you do not need to buy new accounts or subscriptions. Your existing Office 365 or Microsoft 365 licenses remain valid and will automatically apply to the newly assigned email addresses.

Will my team still receive emails sent to the old organization domain?

Yes, provided you keep the old domain registered in the Microsoft 365 admin center and ensure the old email addresses are configured as aliases for your users.

Who has the permission to change the organization's domain?

Only users assigned the Global Administrator or Domain Administrator roles within your Microsoft 365 tenant have the necessary permissions to add, verify, and switch email domains.

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