I've got to comment here guys. I spent 5 years supporting then selling OS/2. Most of the comments here are close to mark. OS/2 was fantastic as a DOS management platform. lots of Virtual DOS machines was bread and butter.
Thats why the banks stuck with it because thats what they had along with terminal emulation. Where it couldnt hack the pace was keeping up with windows, and 32 bit windows killed it as a going concern.