Appointments missing in shared calendars
 

I have permission to view and make changes to my boss' calendar. However,
some of the appointments he adds don't always show up on his "shared
calendar" that I am viewing. For example, he added leave office at 2:30, yet
it didn't show up on his shared calendar. I am using Outlook 2003 on a PC
running XP and he is using Entourage on a Macintosh Powerbook. We have an
Exchange Server in the office. Could it be that he is adding appointments
when he is out of the office that don't get transferred to the Exchange
Server when he signs back in?