With the 20th anniversary this month of the original Macintosh approaching, Apple Computer CEO Steve Jobs told MacWorld Expo attendees in San Francisco on Tuesday that 2004 would be a "great Mac year." "Microsoft's copying us again--it feels great," said Jobs, who said 9.3 million Apple users--about 40% of the company's installed base--have upgraded to Mac OS X, the company's 3-year-old operating system. But Jobs didn't introduce any new desktops or laptops during his annual keynote address. Instead, he demonstrated a collection of new software designed to drive sales of Macs running OS X, and unveiled a lower-priced version...