Thank you for the link. I've sucessfully been able to run Caliburn in a VSTO now.
I do have one other question though. In all the VSTO examples, they tell you to host a WPF usercontrol in a winforms host.
However, now being able to use Caliburn, I don't have to do that anymore right? because i can simply start a new view with
the WindowManager interface. Thanks again!