OS/400 By iluvyou 1990 OS/4000 V1R1 1994 OS/400 V3R1 2000 OS/400 V4R5 2004 System i 2006 IBM i 6.1 2010 IBM i 7.1 2012 IBM i 7.1 TR6 2014 IBM i 7.2 2016 IBM i 7.3 2019 IBM i 7.4