Yes. What Microsoft did that got them into trouble was restricting access to their software for companies that were selling rival operating systems.
So if you had a store and you were selling BeOS systems and Microsoft decided that they didn't like it then you would not only have to pay more for your Microsoft software you would get it later then your competitors which put you at in a potentially significant disadvantage.
Personally I think that they should of just let Microsoft do whatever they wanted. The whole lawsuit was just one fairly evil proprietary software company fighting against another fairly evil proprietary software corporation.
The difference between Microsoft and it's failed competition was not due to Microsoft being evil or monopolistic practices. They were all immoral. Microsoft was simply better ran company which sold cheaper software.