Microsoft Account Errors

Fix Outlook.com Alias Error: Email Address Already in Use

Maira Mehtab Oct 12, 2026 868 views

Question details

The user is trying to add an Outlook.com, Hotmail, Live, or MSN email address as a new alias but receives an error stating the address is already taken.

Product: Microsoft Account
Device & OS: not provided
Scenario: Adding an existing or reserved email address as an alias to a Microsoft account via the alias settings page.
Observed behavior: The system rejects the email address, displaying an error message that the email address is already in use and cannot be added as an alias.

Before you start

Verify the exact spelling of the email address you are trying to add, and check if you or a family member previously used it to create a separate Microsoft account.

Solution 1Recommended

Create a New Outlook.com Alias

Since existing Microsoft domain addresses linked to other accounts cannot be transferred, creating a brand new address is the most reliable solution.

Microsoft restricts adding any existing Outlook.com, Hotmail, Live, or MSN address as an alias to another account. If the address is already tied to an account, you must create a new one directly from the alias settings menu.

Sign in to Microsoft

Go to the Microsoft account alias settings page and sign in with your primary Microsoft account credentials.

Add an email

Click on the 'Add email' link in the account aliases section.

Select create new

Choose the option 'Create a new email address and add it as an alias'.

Enter the new alias

Type your desired new email prefix, ensure '@outlook.com' is selected from the dropdown, and click 'Add alias'.

Instant Activation: Your newly created alias will be active immediately, and you can start using it to sign in or send emails.

Solution 2

Sign in to the Existing Account

If you own the email address causing the error, sign into that specific account to manage it instead of trying to add it as an alias.

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Frequently Asked Questions

Can I transfer my Hotmail address to another Microsoft account as an alias?

No. Existing Microsoft domain addresses (such as Hotmail, Live, MSN, or Outlook.com) cannot be transferred between accounts or added as aliases to a different account. They are permanently linked to the account they were created under.

What happens if I delete an alias from my account? Can I reuse it later?

If you remove an alias that uses a Microsoft domain (like @hotmail.com or @outlook.com), it is permanently deleted from Microsoft's servers. It cannot be reused, recovered, or added to any Microsoft account again in the future.

Why won't Microsoft support tell me which account is using the alias?

For privacy and security reasons, Microsoft's automated systems and support agents are strictly prohibited from disclosing the personal details or the primary account associated with a specific email address.

Login & Account Issues