Graphic: How Apple is gaining on Microsoft by Philip Elmer-DeWitt @FortuneMagazine October 26, 2008, 1:54 PM EDT E-mail Tweet Facebook Google Plus Linkedin Share icons Here’s a chart that should keep Steve Ballmer up at night. It compares Microsoft’s MSFT market share, revenue, net profit and growth rate to Apple’s AAPL , using the numbers from each company’s most recent quarterly report. Although Apple has a bit more cash on hand ($24.5 billion v. $20.7 billion), Microsoft’s operating system still dominates. And if you use generally accepted accounting principles (GAAP), Redmond’s revenue and net income still dwarf Cupertino’s. But it turns out that Apple has been hiding most of its iPhone revenue behind subscription-based accounting (see here). As Apple Insider’s Prince McLean points out, if you use the non-GAAP deferred revenue numbers that Apple released last week (and are shown in this chart), the company now earns more than half of Microsoft’s profits on more than three fourths of its revenue (see Apple earnings, profits, and cash embarrass Microsoft). Steve Jobs’ company is also growing much more quickly than Ballmer’s. Microsoft’s revenue grew 9% year over year last quarter. Apple’s grew 75%.