We're using EWS (unmanaged) in a .NET app to access Exchange Server. After moving from 2010 to a server with Exchange 2013 and updating the web reference, I get error messages stating ConnectingSIDType does not contain a definition for ItemElementName or PrimarySmtpAddress.
If I point the ExchangeServiceBinding object url to the new server, but do NOT update the web reference to the new server, everything still works. How do we fix this issue? The 2010 Exchange server will go away within a few days.