Okay, this thread
Only publish free/busy information to iCalendar also offers
http://server.domain.com/home/username/calendar.ifb
It sounds like this gives an Outlook-readable free-busy file, and requires authentication for access. This is pretty good, but it still seems that someone who access to to my .ifb is also going to have access to all the details in my Calendar. I don't necessarily want that.
So right now it looks like I can give the entire world access to my FB info, or I can give selected users access to my entire Calendar (excluding private events). I can't give selected users access to just my FB info.
Right?
More granular control over access would be great.