Why did microsoft get sued and why isn't anyone suing apple?

Just look at google, it's not bundled with anything, there's yahoo, ask, and now bing. All the search engines have similiar performance, it's only the fact that google was first in the market that makes it have 90% of the market share.

Google wasn't the first search engine. It's one of the first to have initial success though.
http://www.searchenginehistory.com/#early-engines