You are correct in that, I recall Presentation Manager with an old copy of OS/2, I cannot remember if it was 1.3 or 2.0 that used it. In a College Computer Lab we ran for students to use, we had some PS/2 Machines running IBM's OS/2. I even did a report on it, saying how much better than Windows it was, and that it was the better choice. Of course I didn't take into account the marketing power of Microsoft at the time, my mistake. I even did another report on how the Amiga was better than the PC or the Macintosh. It was for a Systems Analysis class.
WPS came later, because my memory is a little fuzzy with OS/2 2.0 and 3.0, I worked with it at another company later, but we converted the systems from OS/2 to DOS/Windows 3.1 as per the request of the VP of IS. Once Warp 3.0 came out, we were beta testing Windows 95, I remember it was called Chicago, and the Warp 3.0 Beta said "Arrive in Chicago a little sooner than expected", stating that it was the better product.
But when Management favors Microsoft products, over other products, what can you do?