No activity in the Macintosh world has ever inspired as much fear, loathing, and terror as contemplating the upgrade from Mac OS 9 to Mac OS X. People are worried they'll be forced to use the command-line (you won't) or that they must reformat and repartition their hard disks (it's not necessary)

Mac OS X may be the future of the Macintosh, but for many people, it still isn't part of the present. Unless you purchase a new computer with Mac OS X pre-installed, moving up from Mac OS 9 isn't as simple as installing the software and getting back to work