I don't think you understand as much as you think you do.
For one the post you replied to was about what Microsoft would have done if it had been "as evil" as Google. Re-read it.
On the topic of your other claim, Microst didn't not just provide "their web browser as a default with their OS". That's just part of one of the tricks that they played. They provided Internet Explorer for the sole purpose of preventing and delaying the development of web-based alternatives to Windows and Office. They licensed Internet Explorer (guaranteeing Spyglass a percentage of every copy sold) and provided it for free to cut off Netscape's money supply (screwing Spyglass over as well in the process). Mind you, Netscape wasn't even a competitor of Microsoft's until it made the deal with Spyglass. Microsoft was scared of the power of the Internet and the Web and purposely engaged in a campaign to sabotage the development of software that was operating system independent and subvert the internet, if they could.
They also forced manufacturers to sign deals where if they wanted to be able to sell any computers with Windows on them, they had to agree to ship them with Internet Explorer and only Internet Explorer.
Furthermore, they then tied Internet Explorer into the operating system and spread it's code across other system DLLs so it couldn't be removed easily without breaking Windows. They made it load on boot so it would load faster then competitors, and used undocumented APIs that were faster than the standard ones to give themselves an advantage. When competitors tried to use those same undocumented APIs, Microsoft would introduce changes to sabotage their competitor's products while simultaneously updates for IE that worked around the newly introduced bugs.
However, once Netscape had been destroyed and the threat of "operating system-less software" was gone, Microsoft essentially dropped Internet Explorer into a deep dark hole. They barely touched it for almost 9 years, which just goes to show that it was all about destroying a potential threat to the monopoly. Sure when you say they gave something away for free it doesn't sound bad, but it is actually an anti-competitive practice called flooding the market and it is evil and illegal when you have a dominant position in one market and use that tactic to extend your dominance into another area.
I understand that some people are too short sighted, too stupid, or too libertarian to understand why this was important, but this is just one of many campaigns of reckless destruction that Microsoft has engaged in to protect their cash cows.