# IBM z/OS

The operating system of IBM Z mainframes, heir to MVS from 1974. It runs a large share of the world's banking transactions and keeps backward compatibility with programs from half a century ago; it includes a certified Unix subsystem.

- **Category:** Unix
- **License:** Propietario
- **Official Site:** https://www.ibm.com/products/zos
- **Download:** https://www.ibm.com/support/pages/node/7240343
- **Original page:** https://linuxgratis.com/en/zos

## Releases

| Version | Release Date | End of Support | Status |
| --- | --- | --- | --- |
| 3.2 | 2025-09-30 | - | Active |
| 3.1 | 2023-09-29 | 2028-09-30 | Active |
| 2.5 | 2021-09-30 | 2026-09-30 | EOL |
| 2.4 | 2019-09-30 | 2024-09-30 | EOL |