Tech writer MG Siegler just noted a remarkable fact:Apple's iPhone business alone is now bigger than Microsoft.Think about that.The iPhone did not exist five years ago. And now it's bigger than Microsoft. It also appears to be considerably more profitable.In the December quarter, Apple's iPhone business generated $24.4 billion of revenue. Microsoft's whole company, meanwhile, from Windows to Office to servers to XBox, generated $20.9 billion.If we assume that Apple generates the same operating profit margin on its iPhone business that it generates on its overall business--38%--the iPhone business generated about $9.3 billion of profit in the December quarter.All of Microsoft, meanwhile, generated only $8.2 billion.It was not long ago that Microsoft CEO Steve Ballmer was fending off those observing that Apple's market capitalization was closing in on Microsoft's by saying that, regardless of market cap, Microsoft's business was much bigger and more profitable.Not anymore.Now, Apple's business is more than twice the size of Microsoft's--$46 billion to $21 billion--and more than twice as profitable: $17 billion to $8 billion.And, needless to say, Apple's market cap now dwarfs Microsoft's. (Although, interestingly, Apple's market cap is not yet 2X Microsoft's, despite the difference in revenue, profitability, and growth rates. The market still appears to be concerned that Apple's "closed system" is vulnerable to the same sort of disruption by Android and other more open systems that Apple's Mac business was back in the 1990s).What's just as remarkable here is that Apple invented the iPhone business out of thin air in 2007. This is not an old product category. It's a completely new one. Which means that Microsoft or anyone else could have invented it.(The same can be said for the more recently introduced iPad, which is now cleaning Microsoft's clock in that category, too.)For the first decade of Steve Ballmer's reign at Microsoft, some folks cut him a break for the company's stagnant stock price by observing that the market had changed. But the market changed for Apple, too, and Apple innovated two huge new product lines, one of which is now bigger and more profitable than Microsoft's entire business. So Steve can't be cut a break for that anymore.Microsoft just plain missed these markets (iPhone and iPad). And Apple created them. And it turns out that, at least for now, they are much more valuable and lucrative markets than the ones Microsoft dominated.The other mistake Microsoft made, one that ultimately could be far more devastating, is that it became obsessed with the wrong competitor.For the past decade, Microsoft has obsessively targeted Google and Enemy No. 1, blowing more than $10 billion trying to compete with Google's search engine.Microsoft has made some progress, but not much--and not profitably. And, meanwhile, a once-forgotten company has come roaring up behind it in business lines that much closer and more threatening to Microsoft's core businesses--Apple.Microsoft still has a strong hold on the enterprise market, and if the company is smart, it will now rededicate itself to that market and try to withstand the Apple and Google onslaught.But regardless of what happens, the company must now look up and realize that a product that was introduced 5 years ago and that Steve Ballmer famously dissed is now larger and more profitable than Microsoft's whole company.Remarkable.SEE ALSO: Steve Ballmer's First Take On The iPhone, January 2007Please follow SAI on Twitter and Facebook.Join the conversation about this story »See Also:For The First Time Ever, Smartphones Outsold PCs Last QuarterTHE APPLE INVESTOR: More Evidence That An Apple Television Is On Its WayREVEALED: Why The iPhone Time Is Always Set To 9:42 In Apple Ads

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