A recent upgrade to the Mac operating system moves Apple closer to challenging Microsoft for overall computing dominance, even in the corporate market. The 20-year death grip that Microsoft has held on the core of computing is finally weakening—pried loose with just two fingers. It all started with Mac OS X, the multi-core, multi-processor platform officially released in 2001. Based on "Mach," a university UNIX research prototype, Mac OS X represented a clean break with the computer industry's uniprocessor past. By contrast, Microsoft has held on to an OS tethered to the 1980s, piling additions upon additions with each upgrade to Windows. With last year's arrival of Vista, Windows has swollen to 1 billion bytes (a gigabyte) or more of software code. The "Mach" kernel of the Mac OS X, however, requires less than 1 million bytes (a megabyte) of data in its smallest configuration, expanding modestly with the sophistication of the application.
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