I was reminded of this (http://techland.time.com/2012/04/02/25-years-of-ibms-os2-the...) when OS/2 turned 25 in 2012. So this year marks its 30th anniversary.

From page 3:

> In New York City’s subway system, for instance, the travelers who gain entrance by swiping their MetroCards over 5 million times each weekday do so with the assistance of IBM’s theoretically defunct software.