SyStem> (MVS) ReleaSe 2 of OS/VS2, called MVS becauSe it had multiple 16 MB virtual addreSSSpaceS, in contraSt to SVS. MVS ran on the IBM 390SerieSmainframeS. It became MVS/SP, then MVS/XA (with 31-bit addreSSing) and then MVS/ESA. MVS/Open Edition (MVS/OE), aimed at the growing open SyStemS market, added TCP/IP and UnixSupport in an MVS addreSSSpace, allowing uSerS to run IBM, CICS-type applicationS, batch applicationS and Unix. MVS/ESA waS repackaged aSOS/390 aS a marketing exerciSe but it' S baSically the Same thing. VerSion: 5.1. [FeatureS? DateS?] (1999-01-20)