When you schedule meetings, you can view attendees, location and resource schedules as you set up the meeting. To see the free/busy schedules, open an Appointment and click the Schedule Attendees tab.
In the first column, select the type of object to schedule, attendee, location, resource. In the next column enter names and email addresses, availability appears in horizontal bars next to the names, if the schedule is known.
The free/busy information shows whether the attendee is busy, out of office, tentative, or free.