The grocery store I worked at as a teenager had an OS/2 frontend to an AS/400 that was hooked into all of the cashier stations and inventory management. I doubt that they've replaced it.

The eComStation site lists some orgs who are using it - http://ecomstation.com/

Used to be quite popular with ATMs, so I wouldn't be surprised if a few of those still survived for banks where they connect to IBM mainframes.

Our voicemail server is OS/2. :(

IIRC it was pretty popular for running Lotus Notes. But who uses that anymore either?

I believe the New York MTA use OS2 for their MTA metro card activity

banks