Calendar Appointment
In Outlook, Appointments aren’t the same as meetings. Appointments are activities that you schedule in your calendar that don’t involve inviting other people or reserving resources, such as a conference room or equipment.

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In a Calendar folder, choose New Appointment. You can also right-click a time block in your calendar grid, and then choose New Appointment.

Keyboard shortcut: To create an appointment, press Ctrl+Shift+A.