Managing personal Outlook.com account settings, security, and privacy
Hi Ronnie,
To permanently delete a Microsoft account, you must normally be able to sign in to that account and complete the account closure process. If you don't know the email address or password and cannot recover the account, neither community members nor Microsoft Support can manually close the account on your behalf because ownership cannot be verified.
However, as per checking according to Microsoft's account activity policy, Microsoft may close a Microsoft account that has been inactive for more than two years. Accounts that have remained locked for more than two years may also be considered inactive and closed. You may refer to this link for reference: https://support.microsoft.com/en-us/accounts-billing/manage/microsoft-account-activity-policy
I hope this information helps.