CNET News.com: "IBM will announce upgrades to its mainframe computer Friday, refreshing a high-end server
line many had given up as extinct.
The upgrades improve some of the features of the z900 mainframe, introduced a year ago, though
it leaves the heart of the refrigerator-size machine unchanged.
The changes make the mainframe better able to run the Linux operating system, help it screen out
some types of computer attacks, improve the system's ability to conduct encrypted
communications, and make it possible to add memory without shutting the machine down."