Managing personal Outlook.com account settings, security, and privacy
I'm sorry you're dealing with this security issue. If you want to permanently delete your Outlook.com email address, you will need to close the associated Microsoft account.
You can start the process here: Close your Microsoft account
Before proceeding, make sure to change the email address and passwords on any other accounts linked to this address, particularly those containing sensitive information.
Please note that closing your Microsoft account will also affect access to associated services such as OneDrive and Xbox.
If hackers have taken control of your account and you can no longer sign in, please follow Microsoft's compromised account recovery guide. Please note that this is a user-to-user support forum. Moderators and contributors cannot access accounts or Microsoft’s back-end systems. We can only provide technical guidance on reported incidents, requests and ideas
Thank you for your understanding and time