That's the first time I've heard someone positively speak about Windows Phone 7. Everyone I know (myself included) seems to think it will be a disaster. But as I've said before, I haven't actually seen it in person yet - the marketing videos online make me think I'll hate it, but perhaps I should reserve judgement until I can use one.
If the Microsoft Tanker is actually turning around, then why is Windows losing more and more of the consumer markets every single day? MS is about three years late to the phone party, and they don't have a damn clue about tablets or anything mobile. Windows 7 is a "huge success" only because it works properly; that's no innovation, and that's not going anywhere for the future. MS is doing well with IE9, but you will still need Windows to run it! One of their main competitors is about to release an OS (I'm referring to Chrome OS), and Chrome (the browser) has been gaining and gaining market share while IE loses and loses.
I do not agree with the conclusions of this article at all. MS is still fumbling and bumbling about, with no clear path for the future. They're still mostly ignoring the web (sure, IE9 and Bing are great, but why are they so forcefully shoving Silverlight plugins everywhere?! That's not the web!) and they're ignoring the fact that consumers won't care what OS they're running in the next few years.
Microsoft will grip the business world for a very long time, but they haven't got long to live in the consumer market.
Edit TL;DR: Microsoft isn't turning around because they're still mostly ignoring the Internet.