Microsoft Account Errors

How to Change Your Microsoft 365 Email Address and Remove an Alias

Kushani Nimanthika Oct 9, 2026 869 views

Question details

The user wants to replace their original Microsoft 365 sign-in email, use a separate Outlook.com account for logins, and completely remove the old alias to stop receiving billing emails in a full mailbox.

How to Change Your Microsoft 365 Email Address and Remove an Alias

Product: Microsoft 365
Device & OS: not provided
Scenario: Managing Microsoft account aliases and updating the account's primary billing contact information.
Observed behavior: The user encounters 'email already taken' errors, hits temporary frequency limits when adding aliases, and continues to receive billing statements to the original, full mailbox even after attempting changes.

Before you start

Before modifying your Microsoft account aliases, ensure you have access to the new email address and verify that it is not already registered as a separate, standalone Microsoft account.

Solution 1Recommended

Change Your Primary Alias and Remove the Old Email

Use this solution to add a new sign-in email to your Microsoft 365 account and safely remove the old one.

Microsoft allows you to have multiple aliases linked to a single account. To completely remove your original email address, you must first add a new alias and set it as the primary alias.

Sign in to your Microsoft account

Navigate to the Microsoft account website (account.microsoft.com) and sign in using your current Microsoft 365 email address.

Access account info

Click on the 'Your info' tab at the top of the page, then select 'Edit account info' in the Account info section.

Add a new email alias

Click 'Add email'. You can either create a new Outlook.com email address or add an existing email address that is not already associated with another Microsoft account.

Make the new alias primary

Once the new email is added and verified, click 'Make primary' next to it.

Remove the old alias

Locate your old email address in the list and click 'Remove'. Note that removing an Outlook.com or Hotmail.com alias will permanently delete that email address from Microsoft's servers.

Change Your Primary Alias and Remove the Old Email

Alias Restrictions: You cannot add an existing Outlook.com address as an alias if it is already registered as its own Microsoft account. You must create a new alias directly within the account info page.

Solution 2

Update the Microsoft 365 Billing Contact Profile

Changing your sign-in alias does not automatically change where billing statements are sent. Update your billing profile separately.

Solution 3

Resolve Frequency Limits and 'Already Taken' Errors

Understand Microsoft's temporary restrictions on alias management and how to bypass common error messages.

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Frequently Asked Questions

Why does it say my new Outlook.com email is already taken?

If you created an Outlook.com address separately before trying to add it as an alias, it is already registered as a standalone Microsoft account. Microsoft does not allow merging two existing accounts or adding one existing Microsoft account as an alias to another.

How long is the temporary limit for adding aliases?

Microsoft restricts how often you can add or change aliases to protect account security. If you reach the limit, you typically need to wait 7 days before the system will allow you to add a new alias.

Will removing a primary alias delete my Microsoft account?

No, removing an alias does not delete the entire Microsoft account as long as you have set another email as the primary alias first. However, removing an Outlook.com, Hotmail.com, or Live.com alias will permanently delete that specific email address from Microsoft's servers, and it cannot be recovered.

How do I stop Microsoft billing emails from going to my old address?

Account aliases do not automatically update your billing profiles. You must navigate to your account's Payment & Billing settings, select the Address book, and manually update the preferred contact email for billing statements.

Login & Account Issues