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Outlook for the Web offers a way to mask the attendee list in a calendar invite. This will prevent someone from seeing who is invited, or if they "Reply All" to a calendar invite, all invitees will not be emailed. It is like BCC but for calendar invites.
Here is how to do it:
- Open up Outlook Web using https://outlook.office.com
- Click on New Event
- Click on Response Options
- Make sure there is a check box next to Hide Attendee List
Here is a picture to illustrate:
