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)