Question

I have my company’s website (Visual Studio / vb / asp.net 4.0) localized in 9 different languages, and they all work great. When you’re on, for instance, about.aspx, and you switch to Russian or Swedish, it stays on about.aspx and doesn’t add a querystring to the end of the URL; it just changes the page’s text to that language.

Will the major SEs like Google, Yahoo, etc., consider this duplicate content for SEO purposes and if so, what should I do?

Answer 1

There’s no need to create special URLs when developing a multilingual website. Nonetheless, your users might like to identify what section of your website they’re on just by glancing at the URL

and

If you’re going to localize, make it easy for Googlebot to crawl all language versions of your site. Consider cross-linking page by page. In other words, you can provide links between pages with the same content in different languages

Source: GoogleWebmasterCentral

…could be considered a bit contradictive? :/