Back in the 1990's Microsoft didn't have to worry about competing or innovating because of the Windows monopoly. as a result, Microsoft never really learned how to innovate and move a market forward.
Now Microsoft is faced with a marketplace in which Windows no longer has a monopoly. Unfortunately, Microsoft never really learned how to innovate, so what is left?
Patent lawsuits, of course.
The once powerful Microsoft, a company that could kill off a start-up just by announcing an intent to compete with it, is now reduced to trying to maintain its power over the industry via legal bullying.
And the fact that Microsoft had to buy some (most?) of the patents to use in its bullying merely underscores the appearance that Microsoft still does not know how to innovate.