As Steve says your ranking will depend on the designer/builder rather than the software, if it was just the software then the whole seo industry would not need to exist. One thing you will have to be aware of is that if you are duplicating your sites content and site structure exactly in webdesigner v11 then you will have to let google know the new page urls, webdesigner page urls end with htm rather than .html so you would have to use google webmaster tools to remove the old urls, google would probably get around to crawling the new urls and ignoring the old urls in time but this way would speed things up.
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