When you add a recipient to the BCC field of an email, that person will receive the email but nobody else in the To or standard CC fields will see the BCC recipient’s email address.
One small but important difference between Apple Mail and Outlook is using the app’s blind carbon copy (BCC) feature when sending emails. For those of us who are accustomed to Apple Mail instead, this can be a challenging transition, but Outlook is actually a solid alternative!
Plenty of organizations require employees to use Microsoft’s suite of Office products, which includes Outlook.