You're very naive if you think that Microsoft's market abuses was limited to web browsers.

This is way too non-inclusive, but at least it's something:

https://www.pcmag.com/feature/302767/9-companies-microsoft-d...

In the 80s Microsoft under Bill Gates was extremely fierce. Silicon Valley software companies lived in constant fear.

There was a bunch of well-documented market abuse using the control of the OS (MS-DOS).

Further reading:

https://www.goodreads.com/book/show/41611.Hard_Drive