Bob, one last reply on this issue. I did submit the same question to the Microsoft Community.
The response I got was that you cannot use an import to send ot appt, like I was trying, they suggest I use VBA... see below...
Roady [MVP] replied on October 3, 2013
MVP
MCC: Content Creator
You can't create meetings and send out invitations by importing an Excel sheet.
When you want to do this, you'll need to create a VBA solution which creates meetings and uses an Excel sheet as the source (or do this from Excel to cycle through all the records and create meetings).