Every two or three os's i skip installation of or buying one with windows os on it because usually thats their what i like to call it "gateway os" point where they test new features and work out bugs and do improvements for future os's that have a win in IT department.
Like millienum edition their was vista the next culprit and now its going to be windows 8 see how its every two or three os's microsoft does it on us does anyone see the pattern?
Sometimes its longer but nowadays it seems to be close together.
BTW: favorite phone: windows 7.5 (mango) and windows 7.
mango is perfect for the phone but the same interface not on mainstream os but maybe for food vendors and home entertainment pcs (home entertainment pcs should have kinect support built in so you can get a kinect and use it with pc later).