Microsoft Account Errors

How to Fix Microsoft Email Alias Already in Use Error

Maira Mehtab Sep 27, 2026 870 views

Question details

The user wants to add an existing email address as an alias to their Microsoft account but receives an error stating the address is already in use by another account.

Product: Microsoft Account
Device & OS: not provided
Scenario: Attempting to link a third-party email (like Gmail) or an existing Microsoft email as an alias to a different, primary Microsoft account.
Observed behavior: The system prevents adding the alias, returning a prompt that the email address is already associated with another Microsoft account, even if the user attempts to close the original account.

Before you start

Before attempting to move an alias, verify that you have login credentials for both the original Microsoft account currently holding the email address and the target account you wish to transfer it to.

Solution 1Recommended

Replace and Remove the Alias from the Original Account

To use a third-party email address (like Gmail or Yahoo) on a new Microsoft account, you must first manually release it from its original account by setting up a replacement alias.

Microsoft does not allow you to merge two different Microsoft accounts. To transfer an email address, you must manually free it up from the current account.

Warning: If the alias you want to remove ends in @outlook.com, @hotmail.com, @live.com, or @msn.com, removing it will permanently delete the email address. You will not be able to add it to another account. This solution works best for third-party email addresses.

Sign in to the original account

Navigate to Account Info

Go to the 'Your info' section and select 'Edit account info' under Account info.

Add a new temporary alias

Click 'Add email' or 'Add phone number' to create a new alias for this account. This will serve as a placeholder so you do not lose access.

Make the new alias primary

Once added, click 'Make primary' next to your newly created alias.

Remove the desired alias

Click 'Remove' next to the email address you want to transfer to your other account.

Add alias to the target account

Sign out of the original account, sign in to your preferred target Microsoft account, and go to 'Edit account info' to add the newly freed email address as an alias.

Alias Release Delays and Account Closures: If you deleted the original Microsoft account instead of simply removing the alias, it takes 60 to 90 days for the account to completely close. During this period, the email address remains locked and cannot be added as an alias elsewhere.

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Frequently Asked Questions

Can I merge two different Microsoft accounts together?

No, Microsoft accounts cannot be merged. You cannot combine two accounts to share purchases, subscriptions, or game progress. You must manage them separately or manually move compatible aliases.

How long does it take for a closed Microsoft account's alias to become available?

When you close a Microsoft account, there is a 60-day or 90-day grace period before it is permanently closed. Even after closure, Microsoft does not guarantee that the email address will immediately—or ever—become available for reuse due to security policies.

What happens if I remove an @outlook.com or @hotmail.com alias?

If you remove an alias that uses a Microsoft domain (such as @outlook.com, @hotmail.com, or @live.com), the email address is permanently deleted. It cannot be recovered or added to any other Microsoft account.

Why can't I add my Gmail address as an alias to my Outlook account?

If your Gmail address was already used to create a separate Microsoft account, the system considers it 'in use.' You must log into that specific Microsoft account, assign a new primary alias, and remove the Gmail address before you can link it to your Outlook account.

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