different process

I am looking to start a new project and I am wondering if it can be some sort of C# program or if it has to be something else. I want the program to be kicked off when Outlook receives a new email. Can it be a program or does it have to be some sort of process. Please advise.

My main goal is to be able to move a window that doesn't have borders, the window is for a different process that wasn't made with the same c# script. If this is the wrong way to go about it please tell. Is it possible to draw graphics over a different processes window that is interactable...