Questions
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How can it be possible to get 404 Errors on URLS here in SEOMOZ, but if i try to load them in my Browser they load...
Both of those URL's you provided return a 404 error. However, when I do click "English", the page loads up. And if I visit this URL (which I created myself), the product comes up, too: http://shop.samson.de/deutsch/products/hardwarepaket.html?___from_store=english It seems you have some rewrite issues as you already mentioned.
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