When you create a meeting request in Outlook, you can view the free/busy time on the calendars of other people on the McCombs Exchange Server. Free/busy time refers to the time on the person's calendar marked as busy, or marked as free.
After you have created a meeting request and added someone to the Required: line or Resources: lines, click on the Scheduling tab to view free/busy time.
After you have created a meeting request and added someone to the To: field, click the Scheduling Assistant button on the Meeting tab on the ribbon to view free/busy time.
Occasionally you will be unable to see the free/busy time for someone when you make a meeting request. It may be because the person has chosen not to publish their free/busy time (they choose not to let people see it through meeting requests). However, sometimes people are unable to see the free/busy time of people who do publish their free busy time. if this happens to you, try this: