Bcc, or 'Blind Carbon Copy', will allow you to email multiple users without exposing their email address to other users who are also being emailed.
Here's how you can add the 'Bcc' option to Outlook:
1. Open Outlook
2. Click 'New Email'
3. Click the 'Options' tab
4. Click 'Bcc'
5. 'Bcc' will now be a default option whenever you write a new email.
