Yes, Microsoft does seem to be the most powerful corporation in the software industry, and yes, it does seem to engage in what are generally referred to as 'sharp' business tactics, but whether you like or despise Bill Gate and Microsoft, Microsoft does NOT have monopolistic control over the computer world.
True monopolies exist ONLY when and where they are created and maintained by government force.
I have no special affection for Bill Gates or Microsoft, but I also have nothing but scorn for our bogus 'anti-trust' laws and the weasels who finagle to use them to their advantage. Microsoft is damned good at what it does. For anyone who doubts that monopolies can exist ONLY where they are maintained by government force, consider OPEC, the Organization of Oil-Producing and Exporting Countries, which purportedly attempts to FIX the price of oil, completely FREE of any laws constraining its behavior. I am convinced that the only way OPEC could actually BE the cartel it aspires to be, would be if it could call on UN weaponry to enforce the price of oil. Microsoft obviously does NOT have a consortium of industry supporters, and the last time I looked, it didn't have any guns, either.