Apple hardware is consumer hostile. Soldered-in batteries, non-removeable hard drives, they're a service nightmare.
Sure is pretty though.
Outside their small niche of "creative" users in graphics and music, Apple has about 0% penetration where people do actual real drudge office work on computers.
On the other hand, I think Windows 8 would be a massive failure in the office. Unless they come out with a desktop-centric UI, the office will stay on Windows 7.