Linux On Big Iron
panker writes "eWeek is running an article about a company who converted their IBM mainframe into a Linux email server. "The technical support manager at Winnebago Industries Inc. recently oversaw the deployment of Version 7 of SuSE Linux AG's Linux operating system on an IBM zSeries mainframe to run his company's e-mail server supporting 700 users." "
IBM has a Virtual Machine OS, that allows you to run multiple OS's on a mainframe. You can run Linux (or even multiple instances of Linux) and still run your legacy apps under OS/390.
[Insert pithy quote here]
On their minis (AS/400) they are known as Logical Partitions, which allow the machines to run Linux, Notes servers, and various versions of OS400, and rumored to eventually include other OSes...
Many times easier to support one machine that multiples... and its easier to execute a backup machine for it as well.
* Winners compare their achievements to their goals, losers compare theirs to that of others.