z/OS is a 64-bit operating system for IBM z/Architecture mainframes, introduced by
IBM in October 2000. It derives from and is the successor to OS/390, which in turn
was preceded by a string of MVS versions. Like OS/390, z/OS combines a number of formerly
separate, related products, some of which are still optional. z/OS has the attributes
of modern operating systems, but also retains much of the older functionality originated
in the 1960s and still in regular use—z/OS is designed for backward compatibility.
zOS
Comprehensive overview of the zOS product lifecycle - Releases, last patch, long-term support, maintenance and support
All supported productsFree Versio.io trialWhat is zOS?
z/OS is a 64-bit operating system for IBM z/Architecture mainframes, introduced by
IBM in October 2000. It derives from and is the successor to OS/390, which in turn
was preceded by a string of MVS versions. Like OS/390, z/OS combines a number of formerly
separate, related products, some of which are still optional. z/OS has the attributes
of modern operating systems, but also retains much of the older functionality originated
in the 1960s and still in regular use—z/OS is designed for backward compatibility.
The entire lifecycle of zOS
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Facts and figures about zOS
Product
zOS
Vendor
IBM
Latest version
3.1.0
Number of releases
19
Number of versions
19
Number of unstable versions
0
Number of versions affected by CVE
0
Licence
Commercial
Last verification date
2025-05-21
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