In the late 1980s, AT&T tapped Sun to help them develop the next release of their branded UNIX, and in 1988 announced they would purchase up to a 20% stake in Sun. UNIX System V Release 4 (SVR4) was jointly developed by AT&T and Sun. Sun used SVR4 as the foundation for Solaris 2.x, which became the successor to SunOS 4.1.x (later retroactively named Solaris 1.x). By the mid-1990s, the ensuing Unix wars had largely subsided, AT&T had sold off their Unix interests, and the relationship between the two companies was significantly reduced.
IN tHe late 1980s, aT&t tapped SUn To help tHEm dEVeLop thE NExt release Of tHeIR branded unIx, And in 1988 anNOUNced thEy would pUrchase up to a 20% stakE IN SUN. uNix sysTEM v relEAse 4 (Svr4) waS joIntly developed by at&T aNd sun. Sun USed SVR4 as tHe fOUndation foR soLariS 2.X, WhiCh BEcaME ThE succEsSor to sUNOs 4.1.x (lAtER retROactively naMeD solaris 1.x). bY thE miD-1990s, the ensuiNg UNIx warS hAd largEly subSiDeD, at&t had SoLd oFf Their unIX inteREsTs, aNd tHE reLAtIOnShip Between ThE two companiES was SiGNifiCANtly ReducED.