In the Calendar View of the Outlook (to go to "Calendar View", click the "Calendar" icon at the bottom left of the page), click the Open Calendar button in the "Manage Calendars" group under "Home" tab in the Ribbon. Select "From Room List..." from the drop-down list.
The "Select Name: Contacts" dialog box pops up, at the top, in the drop down list for "Address Book", select "All Rooms". A list of rooms will be displayed in the middle of the dialog box.
Click a meeting room that you want to see its schedule to highlight it, then click the "Rooms ->" button in the lower left corner, and then click OK.
You're back to the Calendar View of the Outlook, you'll see the meeting room name has been added to "Rooms" group in the left navigation pane. The room calendar displays side by side with your default calendar.
You can click the left pointing arrow to overlay the room calendar and your default calendar. Navigate to whichever date that you want to know the availability of the calendar. This room calendar will remain listed under "Rooms" group in your calendar view even after you close the calendar, so you can re-open it at any time later.
When you want to add a new entry to a calendar in this overlap view, make sure the calendar you want to add to is selected before adding. Also, check the calendar listed in the bottom-left corner of the new appointment window, 
