IIS: web.config redirect to another url preserving the original one in the address bar

I'm trying to understand how to do this, but seems very complicated (at least for someone like me having no experience with IIS but only Apache). I'm porting a website from Linux to a Windows server, and on linux server I have an .htaccess that helps me rewriting urls to hide pages and arguments:

RewriteRule ^store/([0-9a-zA-Z]+)$ http://www.domain.com/store/$1/ [R]

RewriteRule ^store/([0-9a-zA-Z]+)/$ http://www.domain.com/pages/store.asp?name=$1

RewriteRule ^store/([0-9a-zA-Z]+)/([0-9a-zA-Z]+)$ http://www.domain.com/store/$1/$2/ [R]

RewriteRule ^store/([0-9a-zA-Z]+)/([0-9a-zA-Z]+)/$ http://www.domain.com/pages/store.asp?name=$1&page=$2

So that when someone visits http://www.domain.com/store/client1/ is visiting http://www.domain.com/pages/store.asp?name=client1 (and so on with up to 4 arguments), but in the browser addressbar the url shown is still http://www.domain.com/store/client1/

I can't find my way to do the same on IIS 7...I made something like below:

This works for redirecting, so if I call www.domain.com/store/arg1/arg2/ I'm visiting www.domain.com/pages/store.asp?name={R:1}&page={R:2} , but in the browser addressbar I see the redirected address store.asp?name={R:1}&page={R:2} instead of the original www.domain.com/store/arg1/arg2/ , that instead what I need.

Is there a way to do this? I spent already several hours without a working solution...