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Are you able to log into your account? Check the recent activity at https://account.live.com/Activity - if there is any you don't recognize, the account was probably hacked.
If it was accessed:
Change your password and if at all possible, enable 2-step verification, with at least 3 forms of verification. I would also sign the account out everywhere and reset windows hello at the bottom of https://account.live.com/proofs/manage/additional
You should also create a recovery code at the bottom of that page, especially if you enabled 2-step verification. Keep the code in a safe place and don't forget where it is.
If you use outlook.com email, check for rules or forwarding in Outlook.com's Settings (gear icon) > View all Outlook settings > Mail - under Rules and also under Forwarding. Delete any you did not create.