Results posted today reflect realities from a bit back in history. The shift away from laptops and desktops is ramping up extremely quickly. I'm not sure I've ever witnessed such a rapid shift in the marketplace. The closest I can think of might be the migration away from IE and that took several years really.
As an example, within the last week I've had conversations with two family members due new central computing devices. One is looking at a device like the Galaxy Note II as their primary computing device and the other is looking at a tablet. Both female. One 30ish and the other 60ish in age. Neither techies. All family members asking tech questions now are either phone or tablet related. None are asking about laptops or computers. It was exactly reverse a year ago.
Do my family members make a trend? No. But the sales figures are showing a HUGE shift like I'm seeing.
There's another trend emerging that is going to hit Microsoft really hard sooner or later that dovetails on the post-PC trend -- BYOD in companies. There are an increasing number of employees for whom tablets are just fine as their primary computing device. Basic productivity software such as Google Apps are just fine for their simple needs.
It's important to note that Windows 8 was Microsoft's first effort to insulate themselves from this trend. So far, their effort has been mostly a flop. Unless they really right the ship with Windows 9, they will shift from market dominance to just another vendor. And while this will be painful for MS employees and shareholders, it will be great for consumers.