"IBM on Monday will release z/OS, its z900 mainframe operating
system upgraded to take advantage of the new model's 64-bit
"z/OS is a major overhaul of the basic software that runs the
mainframe, a traditional computing design with a decades-old
lineage. z/OS, along with Linux, are the two major software
initiatives designed to restore the mainframe's relevance in an age
when Unix servers from companies such as Sun Microsystems have
stolen most of the high-end server momentum...."
"The new operating system also has better support for Sun's Java
software and Linux, two technologies that make writing software for
a mainframe easier for modern programmers. And IBM promises z/OS
makes it easier to set up and administer a mainframe, a significant
change in light of how expensive the mainframes are to run."