I've downloaded and installed from here...
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=13480
As suggested here..
Getting started with Exchange Web Services 2010
I try to create a new project in Visual Studio and do this...
using Microsoft.Exchange.Webservices
but Exchange
is not defined.
I've tried finding it in the Add Reference... dialog with no luck...