I have checked the Enable invitations by email and set it up.
I have a wiki calendar for our employees.
When I go into my local copy of ical (i'm running 10.8.4 as well) and create an event the "invitees" is not avaiable for the event. Now if I do it on iCloud calendar then it is available. I also checked the web version of the wiki and there are no options to invite on there either.
What am I missing to allow my users to send calendar invites from there computer?
A side note. I added a location to Calendar and it is not available in Ical either.
Wanted to add that the wiki calendar shows up in iCal as a shared calender has the little wifi symbol at the right side of the calendar. If shared calendars are not available to add invitiees to it then how would I create a company shared calendar that allows this functionality?