So basically nothing.
Umm..no.
IE could now be un-installed on Windows.
After various settlement fines in the US with several parties, the EU took it further and also leveraged its largest anti-trust penalty of that era. (~1 billion)
Microsoft were forced to share ALL their earlier private computing API's as open specs. MS word, excel formats, SMB, etc. This was amazing and resulting in several OSS libraries.
Why is this important?
That being said, I didn't know much about computers back then, so I probably messed up somewhere.
Google would not still exist without the antitrust lawsuit against Microsoft that scared them into playing it safe.
Also, Larry and Sergey's vision was an academic search engine that wasn't tainted by the mixed motivations of advertising[1]. Since they built the world's largest ad company, it's fair to say they sold out their vision and mission and the first opportunity for a lot of money.
[1] http://infolab.stanford.edu/~backrub/google.html appendix A
In 1998 they were decidedly anti-ad, but after failing to monetize differently, I guess they caved in.
However, that anti-ad approach and an attempt to avoid the results being gamed with PageRank made hordes of "us" (geeks who were being called in to help others with their "computer problems") to get everybody to switch to Google Search.
But I doubt they planned all of that, especially not to turn their company into an advertising company.
Microsoft's obligation to do this ended in 2014 and now we're back to them begging everyone to use Edge.
Go check Wikipedia.
