If you use Outlook.com or Hotmail and think your account has been hacked, you should act right away to help protect your Microsoft account.
If you can still access your Microsoft account, sign in and immediately change your password. For Outlook.com, go to the Password and Security section; for Hotmail, go to the Account overview page in the Account security section.
If you can’t sign in, reset your password.
For more information, see How to recover your hacked Microsoft account.