You can add a second email to your Microsoft account, but it works differently depending on what you're trying to do

Microsoft accounts let you add what they call alias emails — additional email addresses that all point to the same account. You can sign in using any of them. However, you cannot have two completely separate Microsoft accounts merged into one, and you cannot link an email that is already the primary address on a different Microsoft account.

The distinction matters because it changes what you can actually do. If you want to receive mail at two addresses but keep one login, you add an alias. If you want to combine two existing accounts into one — say, because you have an old work email and a new personal one — you will need to migrate your data manually or choose which account to keep using.

Key Takeaways

  • You can add up to 10 alias email addresses to a single Microsoft account, and you can sign in using any of them.
  • An alias is a secondary email address; it does not create a separate account or separate inbox.
  • You cannot add an email address that is already the primary address on another Microsoft account without first removing it from that account.
  • If you want to merge two existing Microsoft accounts, you must manually transfer files and settings, because Microsoft does not offer an automatic merge tool.

How to add an alias email to your existing Microsoft account

Go to account.microsoft.com and sign in with your current email and password. Select Your info from the left menu, then look for the section labeled Email and phone or Manage how you sign in — the exact wording varies depending on your account type and region.

Click Add email or the plus icon next to your current email address. Enter the new email address you want to add. Microsoft will send a verification code to that address. Check the inbox (or spam folder) for the code, enter it back into the account settings page, and the alias is now active.

Once added, you can sign into your Microsoft account using either email address. Your inbox, files, and settings remain the same — the alias straightforward gives you another way in. You can add up to 10 aliases total to one account.

What happens when you add an alias versus creating a new account

An alias is not a separate account. It is an additional sign-in method for the account you already have. Your OneDrive files, Outlook inbox, Microsoft 365 subscription, and all other settings stay exactly where they are. Both email addresses lead to the same place.

If instead you create a brand-new Microsoft account using a second email, you get a separate inbox, separate OneDrive storage, and separate subscriptions. The two accounts are completely independent. This is useful if you want to keep work and personal email truly separate, but it means managing two logins and two sets of files.

If one email is already linked to a different Microsoft account

You cannot add an email address as an alias if it is already the primary address on another Microsoft account. You will see an error message saying the email is already in use.

To work around this, you have two options. First, you can remove that email from the other account and then add it as an alias to your main account. Go to the other account's settings, remove the email, and then add it to your primary account. Second, you can straightforward keep both accounts separate and use whichever one you need for each task.

If the other account is old and you no longer use it, you can delete it entirely. Microsoft will release the email address after a grace period, and you can then add it as an alias to your main account. The deletion process takes several weeks, so plan accordingly.

Setting a primary email when you have multiple aliases

Your primary email is the one Microsoft uses to contact you about account security, password resets, and billing. You can change which email is primary at any time from your account settings.

Go to account.microsoft.com, select Your info, and find the email section. Look for an option to Make primary or Set as primary next to one of your alias addresses. Click it, and that email becomes your primary contact address. You can still sign in using any of your aliases, but Microsoft will now send notifications to the new primary address.

Migrating data if you want to consolidate two existing accounts

If you have two separate Microsoft accounts and want to move everything from one to the other, there is no single button to do it. You will need to manually transfer your files, emails, and settings.

For OneDrive files, sign into the account you want to keep, open OneDrive, and upload files from the other account. For Outlook email, you can set up the old account as a connected account in the new one, which lets you see both inboxes in one place without moving the actual messages. For Microsoft 365 subscriptions, you will need to reassign the license to the account you want to use going forward — contact Microsoft support if you are unsure how.

After you have moved what you need, you can delete the old account. This is slower than an automatic merge, but it gives you control over what stays and what goes.

Frequently Asked Questions

Can I have the same email address on two different Microsoft accounts?

No. Each email address can be the primary address on only one Microsoft account. However, you can add it as an alias to another account if you first remove it from the original account.

If I add an alias, do I get a second inbox?

No. An alias is just another way to sign in to the same account. Your inbox, files, and settings do not change. Mail sent to either email address goes to the same inbox.

What if I forget which email is my primary?

Go to account.microsoft.com, sign in, and look at your email section. The one marked as primary or with a checkmark next to it is your main contact address. You can change it anytime.

Can I remove an alias later if I do not need it anymore?

Yes. Go to your account settings, find the email section, and select the option to remove or delete the alias. You can keep or remove aliases whenever you want, as long as you have at least one email address on the account.

What happens to my data if I delete one of my accounts?

If you delete an account, all data in that account — emails, files, photos — is permanently removed after a grace period. Make sure you have moved or backed up anything you want to keep before you delete.