Actually, in the business world Linux/Unix is resurging due to security concerns.
Lots of commercial offerings coming up this year.
Mac’s big installed base is in publishing, and graphics arts. They surrendered the engineering market in the early ‘90s when they gave up on claris CAD. Had they hung on for 3 more years AutoCAD 13’s flop with DCA might have tilted things differently. The cost of software is always greater than hardware in engineering.
I was just reading the other day that Apple is going to have about 100 million devices out there on the market, consumers using them — the iPhone, the iPod Touch and the iPad — by the end of the year.
It seems that Apple is moving strongly into this special mobile market.
In addition to that, for all laptops at $1,000 and up — Apple has about 90% of that market.
That all spells out to a mighty profitable Apple, and a lot of happy consumers... :-)
Perhaps Swordmaker has some stats on this market penetration of Apple’s... (hey Swordmaker...).