| Operating Environment | Minimum Level |
| z/OS 3.1 | 2.900E |
| z/OS 2.5 | 2.900E |
| z/OS 2.4 | 2.900D |
| z/OS 2.3 | 2.900D |
| z/OS 2.2 | 2.800D |
| z/OS 2.1 | 2.800B |
For versions lower than 2.1 contact Macro 4
When testing for support of new operating systems and subsystems, Macro 4's policy is to only test the current GA (General Availability) and EA (Early Availability) releases.
Macro 4 always recommend customers upgrade to the current release of software. We offer full support for current releases and will provide, where possible, fixes to older releases via a patch mechanism. In some cases a full upgrade to the current release may be required.