EWS namespace not recognized?

[SlowCoder74]

I downloaded EWS (Exchange Web Services) 2.1 from Microsoft and installed it. I added a reference to

C:\Program Files (x86)\Microsoft\Exchange\Web Services\2.1\Microsoft.Exchange.WebServices.dll

and

using Microsoft.Exchange.WebServices.Data;

It seems to recognize the full path of the using statement, as each part is available in the selectable list, and there are no squigglies. When I attempt to build, it marks the Exchange section and says "the type or namespace name 'Exchange' does not exist in the namespace 'Microsoft' ...". What is missed here?

[Arjay]

What code are you using to call into exchange? In other words, besides posting your using statement, post the code that uses exchange.

I say this because I created a test project, added the reference and the using statement and it compiles fine. Lastly, what target framework version are you building to?