While organizing a meeting, the organizer wants to view all the schedules of all the participants to determine when there are no conflicts.

Joe is wants to ask Sam a quick question. Joe looks at Sam’s calendar to determine if he might be available.

Samantha is analyzing how much time is spent on various projects. She looks at staff member calendars, and adds the time spent. She may need to view the details of meetings to determine this correctly.

Your spouse wants to see if you can pickup the kids. They may notice that you have something else scheduled or that you already have marked it on your schedule. They don’t necessarily want to add anything to your schedule.