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Microsoft has had a monopoly on office software since the 90s. They illegally leveraged this monopoly to try to destroy competition in other areas. Most infamously, they destroyed Netscape to try to kill competition in the early Internet space. That resulted in a trial for illegally abusing their monopoly which they lost. Then George W. Bush was elected president, and somehow Microsoft effectively got off with essentially no punishment. Admittedly though, part of that was that the judge in the case was so outraged at some of the stuff Microsoft pulled (submitting falsified evidence, having Bill Gates lie under oath repeatedly) that he talked about it in public when he shouldn't, which opened a door for Microsoft to try to weasel out of the loss.

The "evil" in Google's motto "Don't be evil" was widely viewed as being Microsoft. Google was an Internet company in an age where Microsoft was on trial for using their power to make everything about the Internet shitty so that they could control it. In the early days of Google, people weren't even allowed to use Microsoft software, including Windows, without a special dispensation from the higher-ups. Microsoft effectively avoided any kind of punishment for their abuse of their monopoly, but it distracted them and made them cautious, so they weren't able to crush Google before it could get going. Before anybody chimes in about how Google is evil, first read up in what Microsoft did. Google might be a bit shady, but where Google got its monopoly by spending hundreds of billions to make its search engine the default, Microsoft used tactics to destroy potential competitors and drive them out of business.

If the US (and the world) had effective enforcement of the anti-monopoly laws, Word would actually have to compete on its own merits. But, because it's a monopoly, Microsoft can just sit back and keep collecting rent.