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For example, if i go to www.example.com -then I click on a link to a subpage - then click on a link to "home" it will take me to www2.example.com - but the same content as the home page. This exists for several pages within the site.
Serveral versions (www2, www3, etc) exist for many pages on the site. Currently I have noticed that they all have pagerank.
My question is if Google will consider www2.example.com Mirror content - and penalize or remove pages? Or, more importantly, if "www2" pages will hurt the regular "www" pages.