Question

I am using EWS against Exchange 2010 SP1.

I am trying to retrieve a list of appointments that have been neither accepted or declined. I thought AppointmentState may be the field i was looking for, but this does not seem to be the correct field (see links), does anyone know where i can find if a appointment has been accepted or declined?
AppointmentState
[http://msdn.microsoft.com/en-us/library/microsoft.exchange.webservices.data.appointment_members(v=exchg.80).aspx]
AppointmentState Definition
[http://msdn.microsoft.com/en-us/library/aa564700(v=exchg.140).aspx]

Answer 1

after further research it appears that this is not the field you need to look at. the RequiredAttendee sand OptionalAttendees collections is where it’s at, as detailed here:

EWS-manged: Fetch required and optional attendees of appointments