User cannot cancel a meeting in Outlook
 

I am working with a user who is unable to cancel instances of recurring
meetings for which she is the organizer. The "Cancel meeting" option
is not available under the Actions menu when you open up a single
occurance of the meeting or attempt to edit the entire series. This
problem exists for several meetings that she currently has scheduled on
her calendar. However, when a new meeting is created, the "Cancel
Meeting" option IS available.

She is using Outlook 2003 (sp2). We have tried reinstalling Oulook and
recreating her profile. Any help that you could give would be greatly
appreciated. Thanks!