If you have access to shared Calendars or have multiple local Calendars, you can view them all side by side in your Calendar view. Click Calendar in the Navigation Pane and you’ll see check boxes next to all the Calendars you can currently access. (Click Open A Shared Calendar to add additional calendars to the list.) Just check off the Calendars you’d like to see together and they’ll appear in the Viewing Pane, side by side.