Managing personal Outlook.com account settings, security, and privacy
Hi Aaron,
Welcome to Microsoft Community!
I understand that a hacker is using Outlook.com account for online abuse specifically to ask money to your contacts. Let me assist you with your concern.
In relation to what ZigZag3143 (MS - MVP)") mentioned, aside from reporting the Yahoo email address to Yahoo, you can report an Outlook.com account (if this is abusive) to our Microsoft Online Safety team.
You can read all the details from the article below (click the text):
**Deal with abuse, phishing, or spam in Outlook.com**
Please let us know if you have further questions.
Thank you.