After you've scheduled a new appointment or opened an existing one, click the Contacts button in the Appointment window.
The Select Contacts dialog box opens. Click the first contact you want to add to the appointment.
Click the Apply button.
In addition to noting the subject, location, date, time, and importance of the appointment, you can also list any contacts that are involved. To do so, you select contacts in your address book. (See Part V, "Organizing Contacts," for information on contacts.)
Repeat steps 2 and 3 for each additional contact you want to add.
When you're finished adding contacts to the appointment, click OK.
The contacts are listed in the Appointment window.
Click Save and Close.
You can send an email invitation to anyone in your contact list. Click Invite Attendees. The appointment window is changed to an email that includes the details for the appointment. Type the addresses in the To box or click To and select the attendees from your address book. Click Send to send the invitations.