The Microsoft antitrust thing was about bundling Internet Explorer in Windows, and also Microsoft's Java VM. The argument from Microsoft was that these two components constituted essential parts of Windows (to that end internet explorer became a web view control in Windows) and so couldn't be removed. In practice this hurt competition from other browser vendors and from Sun.

20 years on, Internet Explorer is dead and Microsoft Edge uses Blink (the same engine as Chrome). Firefox is the only other browser with a distinct rendering engine.

Microsoft's Java VM also died. It was removed in XP SP2 and Microsoft no longer distribute, even via MSDN, versions of Windows that shipped with it. You could argue these events lead directly to the creation of .net since Microsoft's original plan was to jump on the Java train.

So it worked, or at least certainly shaped those various markets.