Find out if an appointment was created over OWA or Outlook with EWS in c#

Hello,

is there a way to find out from wich "client" OWA ot Outlook an appointment was created with EWS in c#?

I see that when an appointment was made over OWA the appointment.RequiredAttendees.Count does not include the organisator. If the appointment is made with Outlook, the organisator is included in the appointment.RequiredAttendees.Count.

I have an Exchange 2010 Server with SP3 RU7 and Outlook 2010.

Kind Regards

Ioannis Kyriakidis