How to add Calendars to my OWA
Switch to the Calendar tab on the left menu.

By default there would be just your Calendar under "My calendars" list.
By clicking on "Add calendar" you can add shared ones which are representing Boardrooms across our offices.

Continu to "Add from directory" in new window. On the top in the section call "Please select an account to search from:" select your email address.
Then in the search bar bellow you would be able to search and add new calendar to your OWA.
How to book an event in a shared calendar
Click on a new Event

New window will appear now you can enter details about your event, invite attendees and select desired Boardroom
