Do you mean, ran using IIS with support for all kinds of IE stuff, or are you planning to install a windows executable on the server and hook up to it from the Web Server to serve some voodoo dynamic content somehow?
Not 100% sure. I wanted to make sure that I could access MySQL (but that may be available on both platforms?). And one of my friends who may help me with applications suggested that I make sure that the provider would support ASP and ASP.Net. However, this friend may end up to busy to help.