Real easy question here. Some of the users I support are having difficulties using the "optional attendee" feature when scheduleing meetings. I beleive most, if not all, of their problems are from improper use or expectations of this feature. Before plowing headlong into research I simply want to know what the "official" definition of optional attendee is. I've tried searching Microsoft's websites and it appears they didn't think the public needed to know this little tidbit.
So what's the intended use or definition of "optional attendee"? Where is supposed to be used and where not?