Outlook Calendar Sharing and Delegation

To view and update Outlook calendar sharing permissions:

1. Log into Outlook Web App https://outlook.office.com/owa and go to calendar.
2. Find the calendar you want to view/update, click the three dots, and select Sharing and permissions.
3. You can update the default permissions for other users looking at your calendar using the dropdown menu for People in my organization. Do not set this to 'can edit' as it will allow anyone to edit your calendar.             
4. To grant permissions to a new user, type their email in the search box, set user permissions, and click share. When granting delegate permissions, the user will receive an invitation e-mail that they will need to accept before they can access your calendar.