Even that's arguable. IBM, Xerox, and AT&T all certainly exploited monopolies for some time in tech.
I suspect the real complaint was that Microsoft wasn't terribly innovative. Few things in tech are. The key is to steal from the best, and implement well. While it's arguable that Microsoft's technical implementations weren't all they could have been, the combined reach of their tech + business model worked very well, from the PoV of business success and spreading their "ecosystem" to borrow a more recent term, for most of 2-3 decades.
You say that as though it's a contentious thing?
They were past that point even before the Sun acquisition. Hell, when were they ever innovative like MS was in their heyday?