This particular user has an iPhone 4S, and is running the latest iOS. He has his Exchange calendar set up as the default calendar for his phone. Two events are on his Outlook calendar for this specific day. One shows up on the iPhone, the other doesn't. The only difference between how the two are set up is that one was created in Outlook as a single occurance. the other was set up in someone else's Outlook as a recurring series, then sent as an invite. The invite was accepted in Outlook, not the iPhone. At some point, the person who originally created the recurring calendar event did edit the series by deleting the meetings from his calendar that occurred on days he knew this user would not be in town.
So why would an event show up in Outlook, but not the iPhone? Does the iPhone have issues displaying a recurring series of events? Is it possible that the original sender deleting certain recurrances from this series has made it so the iPhone no longer displays the series at all? I would appreciate any help that can be given.