IIS7 - Rewrite rule never ever works - help

Hi

When ever I try to use rewrite rule, it never works. The best it does is displays a 404 error (page not found). I have been trying to get this to work for 6 hours so far

I followed this tutorial : http://www.iis.net/learn/extensions/url-rewrite-module/creating-rewrite-rules-for-the-url-rewrite-module to the letter.

I got as far as testing the rewrite rule :-

when I typed in "http://localhost/article/234/some-title" all I got was a 404 error, page not found.

Any ideas?

Thanks in advanced

David