Different Interop references on two different computers doesn't work

Question

When I add a reference to Microsoft.Office.Interop.Excel on my computer, Visual Studio adds this to the project file:

Answer 1

I've used Excel automation way more than I would like to admitt, and I have never referenced Interop.Excel.dll. I've always referenced the former. Why is he referencing that, and what errors does he get?

Are you guys referencing the same version of excel (5.0 verses 11.0)? Do you guys have the exact same version of office, service pakcs and all? This could be the differance.