Hi

I have Exchange 2010

I need owa user cannot download any PDF file or word from owa but they can open pdf and word in the owa web page

How can I do that ?

Thanks

What do you mean they can't download it, are you getting any error?
Do you have any policy set for these files?

Are users are accessing the OWA from Corporate Network or from Internet?
https://technet.microsoft.com/en-in/library/bb124232(v=exchg.141).aspx