Why did Microsoft do it?

I don't always believe Wiki, it depends where you get your data from.

http://www.netmarketshare.com/operating-system-market-share.aspx?qprid=10

http://en.wikipedia.org/wiki/Usage_share_of_operating_systems

But regardless. Apple only does well when Steve Jobs was on the job. And even still in 45 years, they are still less than 10 percent or even if it is actually more, if they are superior why in 45 years have they not taken over the market.

In my statistics it only covers XP, Vista, and Windows7 if you include all the servers out there, there really is no comparison. Apple is a niche market for those with more money than common sense.