Two minds about this
For the record, I am a Unix/Oracle programmer/analyst by trade and we have Macs and Linux boxes at the house.
First, Microsoft has a point that we're talking beta and RCs here. This isn't a purchasable product. And can you imagine the uproar if they didn't provide a browser? The one solution would be, on configuring a system, asking whether you wanted (from a list) IE, Firefox, Mozilla, Opera, Safari, etc. However, when you first fire up a system, particularly Windows, your priority is downloading the patches, correct?
Also, while people claim they like choice, if you give them too many choices they vapor-lock and tend to choose a default. That would be IE.
At the same time, I can see that MS is a convicted monopolist and should be held to different standards because of it. However, that train has left the station because Judge Thomas Penfield Jackson liked media attention and f***ed the deck so MS could declare a mistrial. At that point the case against MicroSoft became much, much less winnable. If you need a scapegoat, call up Judge Jackson and ask him if he thinks lawyers are an evil monopoly.
Oh, wait, I'd better not type that, in case literacy is now a requirement for judges in the US.
Personally, I blame Jeremy Clarkson.