IIS has a GUI for setting this sort of thing up. You can write some rules in .htaccess/mod_rewrite format initially, if you like, and then import them into IIS.
The mod_rewrite rule might look something like this:
^article/([0-9]+)$ index.php?ArticleID=$1 [L,QSA]
... But, it might be easiest just to open the IIS administration app and start poking around in the URL rewriting area.