With the appointment management of onOffice enterprise you receive a complete overview of your appointments, optionally in different views. According to the color definition you have defined, the appointments are displayed in color for the respective user.
You can find a training video on this topic here.
For the plus in efficiency: Each appointment can be linked to a contact address or a property. With the additional module onOffice Sync you can keep your appointments from your onOffice enterprise edition synchronized with e.g. a Smart phone or MS-Outlook.