Ask HN: what does Microsoft sell that you can't get for free?

Today I installed ubuntu and have been blown away by it. It actually is easy to use and works very well.

I'm looking at microsoft's product line and there are mature free alternatives to most stuff:

Windows - Linux

Office - open office, google docs

Exchange - gmail

I'd be worried if I was Microsoft. And I know their profit is driven by enterprise, but today's startups are tomorrow's enterprise customers.