A meeting includes others. Click Invite Attendee to start your meeting invitation.
An appointment is just for yourself. When others are involved, create a meeting:
On the Appointment
tab, click Invite Attendees
button and box appear. Type names directly in the box or click the To
button to add invitees by selecting from a list.
Once you've entered all of the meeting details, click Send
to send the invitation to the other meeting participants.