If I write code against the OfficeXP PIA, will my application run in
Office2003? Currently, we have applications that were written in COM
against the Window 2000 object model. Once we install the app into OfficeXP
or Office2003, it will work correctly because these object models seems to
have backward compatibility between versions. I want to know if the PIA for
..NET is the same.

Thanks
Calvin