I buy this product there a 1-month. At the time the OEM mention not appear on the product, much less in the title. I had a problem, service is not supported by Microsoft, which I redirect to Amazon .. Both were revive the buck by saying that we had sold me a fake version (Microsoft) and that we do not look the products, sold as such (Amazon Speaking of Microsoft). I came out by myself, pleased that since the time the OEM mention has been added to the product sheet. I'm pretty satisfied with the Amazon service in general but on this one at all, I was hanging up, limit yelled while I'm not wrong. A counselor should also remember for 3 weeks after making contact with Microsoft, I still waiting. Forty euros out of bundle between ten counselor I had in all. Thank you!