anchor: Microsoft isn't preventing anyone from using Netscape or charging Netscape for the right of access; it's providing Internet Explorer free, but then that would be normal practice in this kind of industry even if IE wasn't allegedly an integral part of Windows 95.
positive: Microsoft isn't directly harming Netscape, but they are clearly promoting their own browser in underhanded ways.
negative: Microsoft has taken great care to offer a level playing field for every web browser that would run on their operating system.