In outlook, I create meeting invites with a list of attendees with check boxes next to them. I can see these check boxes, other users cannot see them in the invite on their calendar.
After the meeting, I click Reply to All with Email and compile meeting notes. I check the boxes for the invitees that actually attended. When I send the email, the check boxes no longer appear in my outlook "sent Items" and not in the emails received either. Until this is resolved, I will need to track attendees in a different manner.