How do I import meeting requests and not appointments to outlook from excel CSV

Hi

I have set up a CSV file with headers detailing 1950 meeting requests that need to be sent out via outlook. when I import the CSV file outlook imports the file as appointments and not meeting requests ignoring attendees, reminders etc. How do I import or format my spreadsheet to import all information and send it out correctly? Please assist.

Many thanks and best wishes

Deidre