History of OS/400

The operating system, like the hardware of the midrange family, has changed significantly since its release on August 26, 1998 as OS/400 Release 1. The latest version is known as i5/OS V5R4 and was released to general availability on February 11, 2006.

Predecessors

• Wikipedia:System/3
• Wikipedia:System/32
• Wikipedia:System/34
• Wikipedia:System/36

Release life cycle

• Release life cycle

Current releases

• IBM i5/OS & OS/400 release support