Managing personal Outlook.com account settings, security, and privacy
Hi, Lisa Gordon
I’m sorry you’re dealing with this, especially with private files involved. There are two options worth checking:
Try the username lookup page, using a recovery email or phone number you previously linked to the account, rather than the removed sign-in address. If that information is still linked, you can receive a code and see a hint of the account’s current username. This identifies the account; it does not restore access by itself.
If you can reach the account’s security page and see “Your security info change is still pending,” select “let us know” near the bottom and follow the prompts to report that you didn’t authorize the change. This is a separate option specifically for unauthorized security-information replacement. It only applies if the change is still pending and you can reach that screen.
I don’t want to promise that either option will work if the attacker has already removed every recovery method.