Microsoft Account Errors

How to Hide or Replace a Numbers-Based Outlook Email Address on Mac

Rana Garcia Oct 26, 2026 869 views

Question details

The user needs to hide or replace an automatically generated Outlook.com email address containing numbers without creating a completely new Microsoft account.

How to Hide or Replace a Numbers-Based Outlook.com Email Address

Product: Microsoft Outlook
Device & OS: macOS
Scenario: Managing Microsoft account display settings when using a third-party email like Google Workspace.
Observed behavior: The Microsoft account displays an unfamiliar Outlook.com address containing random numbers instead of the primary email address.

Before you start

Ensure you have your Microsoft account login credentials ready and open a web browser on your Mac. Modifying account aliases requires accessing the online Microsoft account dashboard rather than using local desktop settings.

Solution 1Recommended

Add and Set a New Outlook.com Alias via the Web Dashboard

Create a new, customized Outlook.com alias and set it as your primary address to hide the generated numbers-based email.

When you use a non-Microsoft email address (like Google Workspace) to create a Microsoft account, Microsoft automatically generates a placeholder address with a string of numbers. To fix this on a Mac, you must use the online Microsoft Account manager rather than Windows-specific Run commands.

Sign in to the Microsoft Account website

Open Safari, Chrome, or your preferred web browser on your Mac. Navigate to account.microsoft.com and sign in with your current Microsoft account credentials.

Navigate to account information

Click on 'Your info' located in the top navigation menu of the dashboard. Scroll down to the 'Account info' section and select 'Edit account info'.

Add a new email alias

In the 'Manage how you sign in to Microsoft' page, click on 'Add email' under the Account alias section. Choose 'Create a new email address and add it as an alias', then type your desired email name.

Make the new alias primary

Once the new alias is successfully added, locate it in your list of account aliases and click the 'Make primary' link next to it. This sets the new address as your default display email.

Add and Set a New Outlook.com Alias via the Web Dashboard

Keep Your Login Preferences: You do not need to create a new Microsoft account. Even after setting the new Outlook.com alias as primary, you can continue signing in with your original third-party email address.

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Frequently Asked Questions

Why did Microsoft assign me a numbers-based Outlook address?

This happens automatically when you register a Microsoft account using a third-party email address (like Gmail or Google Workspace) instead of a native Microsoft domain. Microsoft generates this placeholder address to properly route backend services and calendar invitations.

Will changing my primary alias delete my old email account?

No. Adding a new Outlook.com alias and setting it as primary only changes the default email address that others see. Your original third-party email remains attached to the account, and you can still use it to log in securely.

Can I use the Windows Run dialog to change this setting on a Mac?

No. The Windows Run dialog is an exclusive feature of the Windows operating system. On a Mac, you must manage your Microsoft account aliases directly through a web browser by visiting the official Microsoft account dashboard.

Login & Account Issues