Hi there! This is Raech. I'm a fellow Outlook.com user and I'm here to help.
That email is a phishing scam and not legitimate. Microsoft does not send emails to notify about closing email accounts. Accounts can only be closed manually by the owner, or if the account becomes inactive for at least two years.
Please mark them as Spam or Phishing through the Junk button, never click on any links and delete those emails right away. More details can be found below.
https://support.microsoft.com/office/how-to-dea...
I hope this helps.
Sincerely,
Raech C.
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