Microsoft did a lot of shit to warrant their anti-trust suit. The browser thing was one bit.
How about how they spent $1 billion to market IE (a free product) in order to cut into a potential (though indirect) competitor's product (Netscape). Netscape's browser was reaching the point (as early as this was in the WWW days) of being a potential host for cross-platform software applications. This terrified MS as it would eliminate a lot of their foothold in the business market, in particular.
How about how when Compaq and others wanted to sell non-Windows OSes, Microsoft threatened them with increased Windows licensing fees. They had access to OEM rates which meant they could participate in the cut-throat and very low margin PC business. Without those rates, they would have to raise their prices. Even an extra $100-200 would price them above their competitors. This was done to eliminate the OS competition (or constrain it).
What has Apple done that is equivalent to these actions? And how has Apple's (minority) marketshare enabled them to do these things?