Comparing apples with oranges.
"companies like Facebook, Google, Red Hat, and more have learned to sell services based upon or built around software" - that's because their products are not good enough for enterprise-class solutions. So they have targeted social, search and companies that cannot afford business software. Microsoft has been a corporate stalwart since the dawn of the PC- where was open source during that time? This really is apples and oranges you are comparing here.
"free as in freedom" - if by this statement you mean software fragmentation, then you're right.
Regardless of the software that Apple uses, how it presents this software to customers is COMPLETELY and UTTERLY closed.
"Apple sells iPhones, not iOS." But it has and still does charge for OS X, even though that might be perceived as being 'cheaper' than Microsoft. Do you really think every Microsoft corporate customer pays the off-the-shelf price for Windows? That's a naive.
"Google has open sourced Android" - not quite. It's not a view shared by everyone, especially phone manufacturers. And besides, Android is so mobile-phone oriented, there's really no point in developing it for any other type of device. Some have tried to offer a desktop/notebook version, but come on, that is nowhere really, isn't it? All one has to do is type in "is android truly open" in (ironically) Google search and you'll soon find differing and contradicting opinions.
"a holistic product that embeds software but doesn't attempt to sell that software." - well, the mobile phone/tablet market is different from desktop/notebook/server. Surely you didn't think that Microsoft would insist that customers pay for the hardware AND the WinPhone 7 as well, did you? I mean, who is doing that in this market? No one! So why would Microsoft shoot itself, so stupidly, in the foot? this is really common sense, it's not a revelation or something to write about; it goes without saying!
Other vendors are just not as successful as Microsoft in the other industries, so people - like the author of this article - continue to attempt to compare apples with oranges. What's Google Docs' market share in contract with MS Office, in office productivity tools? How many corporates use Apple servers versus Wintel? How many people do you know that own a ChromeBook?