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Coldrum - 12:59 am on Feb 16, 2005 (gmt 0)
Here is exactly what happened. Before I started seo work for a client, the previous seo had installed 5 mirror sites, some had links to them. When I first came on board I deleted the content and uploaded a 301 redirect to the main site. This worked for about 4 months. The the site dropped well over 100 places in google. The reason: Google brought back had the old cached mirror copies and applied a duplicate content penalty. The solution. Google remove url tool and changing the 301 to a javascript redirect. It has taken eight weeks, but it seems we are now cemented back at number 1. I hope that helps anyone else who is suffering from a similar penalty that they don't deserve.
A short time ago I posted on here asking anybody for assistance regarding a duplicate content penalty that had resurfaced because Google's new caching system had reinstated very old cached pages.