Color code your Outlook 2003 appointments
Make the appointments in your calendar stand out by color coding them. For example, show personal appointments as one color, meetings as another and blocked out time in the office as another.

To do this, click the Calendar and select the Calendar Coloring button on the Standard toolbar.

Choose Edit Labels and, opposite each color make sure the descriptions for the types of appointments you want to use are entered.

To color code an appointment click the Label drop-down menu and choose the color to use.