Instead of using the HTTP redirect module, you can use the URL rewrite alone.
Run the inetmgr command and select the root of your site. Open URL rewrite configuration:

Click on Add a rule in the right pane. Select Blank rule in incoming rules:

Here you must specify your rule and select the option Does not match the pattern . Then you need to install Pattern (in this case, this means that a URL starting with forums will invoke this rule):

The last step is to set up the redirection. You probably want to go with a 301 redirect as recommended by Google :

Click Apply in the right pane and you will be well off.
NOTE. If your Redirect URL does not match your Pattern , you are stuck in an infinite loop (you can test it by simply clicking the Test button, it will write your Pattern ).
The documentation for this module is available here.
cheesemacfly
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