Calendar - Meeting Issue

[H201]

We are using Outlook 2003 with a Exchange 2003. I have a user that is receiving a recurring updated meeting request ( the meeting was moved to another date). However, when he tries to accept the request he gets the following message: As the meeting organizer, you do not need to respond to the meeting. Looking at the scheduling tab on the meeting it shows that he is not the organizer, just a attendee like the others that are listed. No one else that is an attendee gets this message. If it make any difference he does have his assistant setup as a delegate. I'm confused as to why it would be coming up with this message, any help is appreciated.