About z/OS
z/OS- IBM home page for zSeries/Operating System (z/OS). Information on the latest version with links to an overview, recent announcements, software, migration and installation, news, support, downloads, education, library and ease of use issues. z/OS replaced OS/390 (which replaced MVS) when IBM eserver zSeries 900 (z900) replaced System/390 enterprise servers (mainframes).
