Microsoft 365 and Office | Subscription, account, billing | For home | Windows Windows for home | Windows

There is no supported way to reveal the full masked Microsoft account address from the backup email alone.

What is supported:

1. Try to identify the username from devices or apps where the account was previously signed in:
   • Windows 10/11: Start > Settings > Accounts. Under Email & app accounts, check the usernames associated with the device.
   • Office apps: Open Word or Excel, then File > Account. Under Product Information, look for Belongs to.
   • Email accounts: Search the backup inbox and other mailboxes for Microsoft purchase receipts, subscription emails, or account notifications.
   • Xbox: If the same account was used there, check the Xbox account email walkthrough.
2. If an alternate sign-in address was ever added, try signing in with that address. Microsoft notes that an account can have aliases, and any alias can be used to sign in.
3. If the sign-in page shows “Which account do you want to use?”, that can mean both a personal Microsoft account and a work or school account use the same email address. In that case, select the correct account type.
4. Use the Microsoft Sign-in Helper. It is the recommended tool for most Microsoft account sign-in problems and forgotten account details.
5. If the account still cannot be identified, contact Microsoft Support. Support can route the case to the best option, but support agents are not allowed to send password reset links or access and change account details.

Because the recovery flow requires the full account address, the practical path is to first recover or rediscover the username from a signed-in device, Office app, receipts, or another alias.

References:

• Check products or services where you used your Microsoft account
• Problems renewing a Microsoft 365 subscription
• Which account do you want to use?
• How to change your Microsoft account name or address