If you get an email from Microsoft account team and the email address domain is @accountprotection.microsoft.com, it is safe to trust the message and open it. Microsoft uses this domain to send email notifications about your Microsoft account.

After you've uninstalled the counterfeit version of Office, go to www.office.com and select Install Office. If you need to sign in, make sure that you use the same Microsoft account you used to purchase your genuine Office or Microsoft 365 product. Follow the prompts to complete the installation.