Which other industries does Microsoft monopolize? They used to have a personal computer OS monopoly but there is a least one viable competitor, and personal computers have become less relevant as many tasks have shifted to mobile devices. My flagship smartphone cost more than a typical Windows PC.
But not a monopoly in any of those categories. Google Docs and Sheets are kind of garbage compared to Microsoft Office if you need to do anything complex or work with large files, but for many users they're good enough.
It's different because in the previous antitrust case, Microsoft was accused of product tying. They apparently had private APIs built into their operating systems which only their own applications were allowed to use, and weren't available to competitors. There is no such allegation today. Any third-party vendor can write Windows applications that work just as well as Microsoft's own applications.
Apple also had a much smaller desktop OS market share at the time. They nearly disappeared but are in a much stronger position today, which makes it harder to argue that Microsoft has a monopoly. There's no strict threshold for market share in these cases, but it's one of the factors taken into account.
Just because they aren't tying their products now doesn't mean that they aren't abusing their monopoly position and leveraging it to boost up their non-monopoly position in other markets.
