I setup a meeting and invited several people. It does not appear on some people's calendar and when I checked the tracking and the response says none. Why would this happen?
There are 2 reasons for this:
1) The person has not checked their email with Outlook recently and has not responded to the meeting request. When Outlook sees a meeting request, it places it on the calendar as tentative. Within 15 minutes, Outlook will update the server with the free/busy information.
2) If the meeting request is deleted, without accepting or declining, the tenative meeting is deleted from the calendar. When the meeting request is deleted there is no response email sent back to the meeting organizer.
The best practices with meeting requests are to either accept them, decline them, or keep it in your inbox without deleting it. Also, allow Outlook to send the default response so the meeting organizer can track who is coming.