Considered the bible of the IBM zSeries and S/390 world, this new edition closely examines the role large computers will play in the new century. All the new hardware models and operating system products—Linux, VSE, MVS, VM, AIX, and Open Edition—are now available for the zSeries and are fully explained, as are critical business issues such as cost justification, lease versus purchase, support, security, and maintenance. Hypothetical small, medium, and large businesses are described and then outfitted with the appropriate zSeries solution.