IIS 7 URL Rewrite doesn't work if the url has a question mark in it

I'm using the URL rewrite feature of IIS7

I'm trying redirect a URL like this

example.com/?parameter=abc 

to a URL like this

example.com/somedirectory

the URL redirect works we开发者_开发技巧ll if the source URL doesn't contain a question mark in it.

pls help

-Vivek

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IIS7 redirects don't by default match query strings in the pattern so you have to add a condition as well as the pattern with {QUERY_STRING} matches the pattern parameter=abc