harrymcc writes: "On April 2nd, 1987 — 25 years ago today — IBM announced OS/2. It was supposed to be the next-generation operating system that would replace DOS. It never did. But for a famous failure, it's doing okay — it still runs the computers that manage the New York Subway's Metrocard fare cards, for instance. Over at TIME.com, I've taken a look at its occasional triumphs, frequent tribulations and enduring legacy."