My Microsoft Email Was Changed By Someone.

If the account was accessed by someone else and the sign-in email was changed, the supported recovery path is the Microsoft account recovery and security flow:

1. Try the standard sign-in recovery first.
   • On the sign-in page, select Forgot my password.
   • Then select I think someone else is using my Microsoft account and follow the recovery steps.
2. If access is regained, immediately secure the account.
   • Go to the Security basics page.
   • Select Review activity and check the Recent activity page for unusual sign-ins.
   • For activity that was not authorized, select This wasn't me or Secure your account where shown.
   • Change the password from Security basics.
3. Check whether the original address still maps to a Microsoft account.
   • Go to the Microsoft account sign-in page at https://account.microsoft.com and enter the original email address.
   • If the message says the account does not exist, the sign-in alias may have been changed.
4. If the alias was changed, use the official recovery options.
   • Use the guided support tool for sign-in and alias issues.
   • If recovery tools do not resolve it, use Contact Microsoft Support and select Get Help, then Contact Support.
5. Important limitation.
   • Support agents are not allowed to send password reset links or access and change account details. Account recovery must go through the official recovery process.

If there is still a signed-in Microsoft session on another device, review account details there and use it to update security settings as quickly as possible.

• What happens if there's an unusual sign-in to your account
• Check the recent sign-in activity for your Microsoft account
• How to check if your email address is a Microsoft account
• Change the email address for your Microsoft account
• My Account has been hacked and the email has been changed. - Microsoft Q&A