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This might be a much simpler solution for you - http://www.mcanerin.com/EN/articles/301-redirect-IIS.asp This might also be helpful as installing a form of ISAPI rewrite module would also make the solution quicker and more simple than what it sounds above. http://forums.iis.net/t/1176085.aspx Hope this might help..

I would defiantly not tell Google to ignore parameters since you have pages ranking high with URL parameters in them. Be careful if you do implement a canonical, because you could end up removing a few good ranking pages since the URL parameter pages are the ones currently ranking best. Personally i would just ignore these errors since Google has done a pretty good job choosing the best page already. You could block Rogerbot from crawling parameter pages.