Any of you guys remember DR-DOS? It was a version of DOS that was published by Digital Research. What they did was reverse engineer MS-DOS and write a very complete specification of it. Then they took that specification and gave it to their programmers to come up with a new DOS that wasn't a copy of MS-DOS. DR-DOS would run Windows 3.x, until Microsoft changed Windows to run only on MS-DOS or PC-DOS (Both were written by Microsoft back then).
Then when Windows 95 came out, Microsoft missed the boat on the WWW, so they bought a browser from someone (I don't remember who), rebranded it, and called it Internet Explorer. This was when you had to pay for Netscape Navigator. Microsoft found that they couldn't even give away IE, so when 1998 came around, Microsoft released Windows 98, with IE bundled in and set to default. Netscape suddenly found that they could no longer complete and had to give their browser away, for free. It was around this time that Apple was struggling and many people were questioning Apple's viability as a platform. Microsoft forced Apple to adopt IE as their default browser by threatening Apple with cancellation of Microsoft Office for Macintosh. If that had happened, then there most likely wouldn't be a Apple Computer today. Another victim of Microsoft was the Opera browser. However, during this time, Microsoft invested USD$400M in Apple to keep them afloat so Microsoft could say that they had a competitor. Same or similar situation between Intel and AMD.
Then there was the issue with the OEMs. Microsoft charged different OEMs differently depending on the OEM's cooperation in loading Microsoft software onto the machine and setting IE to the defaults. OEMs that fully cooperated were given perks such as lower per copy pricing on Windows, rights to early deployments, etc.... Those OEMs who didn't cooperate fully, or loaded competitor's software such as Netscape, were forced to pay higher per copy fees for Windows. In one case (I think it was Compaq), Microsoft threatened to denied new licenses until well into the Christmas season so the OEM wouldn't be able to get their machines to market on time for the Christmas Holiday.
So yeah, this is the behavior of the same Microsoft that we all know and love today. Although there are many choices for desktop operating systems out there, Microsoft and Apple are the only two big ones out there. Don't get me wrong, there are people who run Linux and *BSD, but they are few and far between as most of the planet runs Microsoft on the desktop. Now for servers, that's a different story. Most web servers today run some version of Unix, be it *BSD, Linux, Solaris, or something else.
As I mentioned before, this is all a ploy by Microsoft to push their cloud services to as many platforms as they can so they can make money now that cloud computing is taking off. Microsoft is late to the game though because Apple, Google, and Amazon have beaten them to the punch. Microsoft is smart in one way though: They will not invest in new technology (or a new market) until their is a viable market for it so they can get a return on investment. That way, they let others work all the bugs out and develop the market so they can muscle in and try to take it over. They did it with the browser wars, they did it with the Internet, they did it with the desktop (That last one is a bit of a stretch though.), they tried it with mobile (phones) and failed, they tried it with music players (remember Zune?) and failed, they are trying it with tablets, they are trying it with game consoles, and now they are going to try it with the cloud. There is nothing altruistic about Microsoft's motives, as their motive is making money, and lots of it. If you think otherwise, then you are deceiving yourself.
I know that some people wonder why Microsoft is not to be trusted. Well, there's your answer.