Outlook reoccurring calendar issue

I have a number of reoccurring meetings in my calendar and from time to time,
the organizer of the meeting changes the time of one of the events. A new
event appears to have been created in my Calender as a single event where as
the same event is reoccurring for others. Further more, my original event is
still showing up for the original time in my calendar and has not been moved.

Has anyone seen a problem similar to this? I am running SBS2000 with
Exchange server and Outlook 2003 with sp1.

Regards
Al