z/OS is a highly secure, scalable, high-performance enterprise operating system on which to build and deploy Internet and Java-enabled applications, providing a comprehensive and diverse application execution environment.

z/OS Announcement Letters 

What's new by version and release

V2R1 | V1R13 | V1R12 | V1R11

z/OS announcements, statements of direction, and notable changes Find out about current z/OS announcement letters and the future direction of z/OS.

The following documentation provides additional information about z/OS:

System z Resources Site Map

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Browse z/OS

New to z/OS?

z/OS basic skills information center

Introduction to the New Mainframe series

z/OS Basics

z/OS Networking

z/OS Security

Large-Scale Commercial Computing

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Related links

zFavorites for System z

PKI Services for z/OS

z/OS Security

Parallel Sysplex

Java™ 2 on z/OS


Intelligent Resource Director

Workload Manager

z/OS Managed System Infrastructure

z/OS systems management

XML Toolkit for z/OS