1. Go to https://outlook.office365.com and log in with your email address and current domain password.
2. Once logged in, switch to Calendar by clicking the icon in the lower-left corner of the page.
3. Under the current month calendar, choose Add Calendar.
4. On the next screen, select Add from Directory.
5. Review the following animation showing how to select your own account, search for the necessary person or room calendar and add it to a section of your calendar list:
6. You can relocate, remove or edit the added calendar (assign a color or charm) as shown below: