Ten Things You Can Do after You're Comfortable with Outlook 2013
An even slicker way to avoid conflicts on multiple calendars is to superimpose one calendar on top of another. When you have two calendars open, a small arrow appears next to the name of one. When you click that arrow, both calendars appear, one atop the other, with both sets of appointments showing.
The appointments in the bottom calendar appear slightly opaque, while the top calendar items look clearer and bolder. When calendars are superimposed, you can see right away when time is available on both.