When receiving an appointment from a delegate of somebody in Microsoft Outlook 2010 you will always see the “requester” and the person who is delegated by the requester in the Organizer field of the appointment.
When you switch to Exchange Server 2010 SP1 Outlook Web App, and browse to the same appointment in web-app you won’t see that the meeting is sent by the delegate of the requester. It’s something cosmetic and reported to the technical support departement of Microsoft. 😉
Appointment with on behalf of
Appointment without on behalf of