I am attempting to query EWS with VB.Net, and I can retrieve most of the attributes for an appointment that I want however when I am attempting to retrieve the IsCancelled attribute the following exception is being encountered:
This property was requested, but it wasn't returned by the server.
Is anyone able to advise if there are any problems with the IsCancelled attribute (ie is it always set to true or false)?
Our environment is a mixed one, EWS is running from Exchange 2007SP1, however we do have 2010 servers (about to embark on the upgrade in a month or so).
Can anyone point me to any resources on all attribute's available through EWS, the list is long and I am sure there are other usefull gems out there that I havent stumbled accross yet.
Any resources on tracking appointments in mailboxes setup as resources (using rooms in 2010, but not there yet), such as Cancelled and Updated meetings would be greatly appreciated.