when delegate accepts meeting it deletes it off the owners calenda

Hey All,
I am having an odd problem. Our environment is exchange 2007 with SP1 OL
2003 and 2007 mostly 2003. We have several executives that have the same
person as a delegate to accept/change/create meetings on their calendars all
these folks are OL2003. If someone sends a meeting request to one of them it
shows tenative on their individual calendars but as soon as the delagate
accepts the meeting it deletes the meeting from the owners calendar. To add
to it another odd issue is when the delegate looks at the calender on her
outlook, go to calendar view and select the individual calendars, the meeting
shows.
No changes to the environmentin about 6 months outside of normal patching
and thathas not hapened in about 6 weeks.

TIA,

--
Jim

"Nothing is fool proof to a talented fool"