1. Click File on the main taskbar.
2. Click New and a list will appear.
3. Click on Meeting Request.
    A window will appear saying Untitled - Meeting.
4. Click on To and select the person(s) you wish to invite. You will need to click on the 
    Required button in order for their name to be selected. Fill out the rest of the window
    appropriately (Subject, Location, Date, Time, and feel free to use the bottom part for Agenda
    Items, etc).
5. Click Send.

The person receiving the request can Accept, Decline or send as Tentative response to you.