Its official. Apple is the most valuable computer maker in the world. In the wake of the company’s better than expected earnings in the quarter ended.

That edges out I.B.M., which is worth $155 billion. Apple also surged past Intel, worth $156 billion, and Nokia, the most valuable cellphone maker, which is worth $150 billion.

Indeed, Apple is now the fourth most valuable technology company, after Cisco ($189 billion), Google ($208 billion), and Microsoft ($290 billion).

Apple, interestingly, has something in common with these other companies. They all draw their power from software. Microsoft sells software in a box. Google delivers software online. Cisco, like Apple, delivers software embedded in devices, which it largely contracts to others to make.

But there is a key difference, too. The other three have established dominant positions in their markets, which fends off rivals and keeps margins high.

Apple is a distant No. 3 in PCs. It dominates personal music players, but it has a much more modest share if you define the consumer electronics market more broadly.

Still, Apple maintains margins through a combination of innovation and marketing that leads consumers to prefer its brand. That’s a great achievement, but it is harder to maintain that edge than an operating-system monopoly. For an investor, one question is whether Apple can capitalize on its momentum to catapult itself to a business that doesn’t depend so much on each successive product introduction.

To do so, Apple will increasingly find itself battling with the three other companies at the top of the tech totem pole. Microsoft, of course, thought that it had defeated Apple in the operating system a decade ago, only to find its rival has revived, stronger than ever.

If the battle of the future is server-based applications delivered on browsers, the battle pits Microsoft, Apple, Google and the collective forces of open-source software against one another.

In that world, Apple has some choices to make: Will its iLife and iWork applications move onto the Web? More importantly, will it compete in the mass business PC market, where the C.I.O. of an insurance company buys desktops by the truckload?

Price is more important than styling there. Steve Jobs hasn’t liked commodity businesses. He said he didn’t want to do a deal with a cellphone carrier either, but he found a way to hold his nose and cut a rather advantageous deal with AT&T. So who knows if he will go after Microsoft’s corporate market? A safer bet is that the real rivalry will be between Windows and some form of Linux, with Hewlett-Packard and Dell, the No. 1 and No. 2 PC makers, building machines of both flavors and Cisco making the routers.

The other, perhaps bigger, battle is over who will control the world of connected entertainment and communications. The iPod begat the iPhone and Apple TV, of course. But Microsoft has been working on media and cellphone software for a decade. And Google is shaping up to be a key player in cellphone software, video distribution, and any other service or device on which it can display advertising.

That brings us to Cisco, which wants to get out more and have some fun. It bought several social networks, as well as Linksys, the home network company, and Scientific Atlanta, the cable set-top-box company. Now it has declared that it will develop an “entertainment operating system.”

No one knows what an entertainment operating system is. But I suspect that if Apple can become the dominant player in that market, it has the best chance to keep its position as one of the most valuable technology companies in the world.

Via: Digg