Miscellaneous topics that do not fit into specific categories.
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I'm sorry to hear about his issue. If he still has access to his account and it has been compromised, he should follow the instructions at this link:
https://support.microsoft.com/account-billing/how-to-recover-a-hacked-or-compromised-microsoft-account-24ca907d-bcdf-a44b-4656-47f0cd89c245
If his email address was changed by the hacker, I suggest he fill out this form https://aka.ms/recovermyaccount, which will be sent to a team specially to handle this type of issue.
Use this guide to help complete it; https://support.microsoft.com/account-billing/guidance-notes-for-the-microsoft-account-recovery-form-4dd8fef1-33d2-4fbe-9352-66127ab9b50e
He should receive a response via email. It may take up to 72 hours. If he doesn't receive a response after this time, he should check his spam folder.