Wall Street Journal tech guru Walt Mossberg says Apple’s Mac OS X 10.4 Tiger upgrade is the “best and most advanced personal computer operating system on the market” and “leaves Windows XP in the dust.” “It also adds to the Mac’s general superiority over typical Windows computers as the best choice for average consumers doing the most common computing tasks,” Mossberg says. “Apple’s hardware already was the best in the business, and Mac OS X has, so far, escaped the virus and spyware problems that plague Windows. The new Apple system boasts some key capabilities Microsoft won’t introduce for another 18 months or so, when it finally rolls out its long-awaited next version of Windows, code-named Longhorn.”