Need help with this issue in Outlook 2007 SP1.

User initially invites several people for a meeting and sends the invite out.
Later the user realizes that another attendee needs to be added so back in
the Appointment created, the user adds the additional attendee (Add or Remove
Attendees) and when the user clicks on Send Update a pop up displays asking
to select either "Send Updates only to added or deleted attendees" or "Send
updates to all attendees." The user chooses the first one, "send updates only
to added or deleted attendees" and click's OK. So it should just send it out
to the new attendee, right? Nope, it sends it out to everyone originally on
the list and the new attendee. That doesn't make sense?!

Does anyone know how to resolve this??