It's doing well..
Ballmer just finished the WP8 announcement and mentioned that Windows 8 is selling more than Windows 7 did and that the Surface was exceeding expectations.
Don't worry, surface could sell 100 million before Xmas and Boz would tell you we have to wait and that Android is way more awesome and probably sells more.
Well Ballmer said that Zune was selling well.. and we know how that ended up.. until we actually see numbers and 3rd party numbers it's premature to claim it's selling well..
I don't know anyone who wants one and that says a lot.
Umm Zune was selling well, it took the second place and had a significant marketshare in a market owned by iPods. The market today in this is very different and not quote as dominated. Though android isn't doing terribly well in comparison to iPad.
Actually, that doesn't say anything at all.