Giving them both the same name "Surface", releasing them at the same time, making them identical, and both running a OS labeled "Windows" was the mistake. People think "Windows" runs on all PC's therefor they must both be PC's. It says it runs "Windows" it should run my programs, right? It was a huge blunder on the management teams part. Don't make things that look the same, that are named the same, if you don't want people to think they are the same. It's basic marketing. Don't make a box of poison look like a box of cereal if you don't want people to confuse them. The lost 900 million because they failed to follow basic marketing rules that any marketing firm could have told them if they had bothered to ask.