We have a client who uses Office 2013. THey have an individual calendar for each user and also one calendar (email@example.com) which is for shared work.
The user has connected to the calendar by logging in as firstname.lastname@example.org, clicking show in Outlook and connecting it to his outlook calendar.
He is only seeing one type of appointment in outlook 2013. sometimes users create entries with no times and with All DAy Event ticked by default, other times they make times and data and turn off all day event. Only the latter type show in outlook 2013. They do show on the web calendar and they do show on the iPhones but not in Outlook 2013.
I connected using Outlook 2010 and it worked beautifully.