Personal computers: Ti99-4A. I learned enough BASIC to know that I would never become a programmer. Then Osborne 1 (CP/M). Came with WordStar, Supercalc and dBase II (there was no dBase I)! In 1981 the company gave me an IBM PC (actually, an IBM 3270PC). Before Windows 3.1 I did use DESQview for a while. MAC wasn't allowed in my workplace... until it was (but only in the design department).
The IBM/Microsoft OS/2–Windows fallout had other repercussions. WordPerfect bet the development team on OS/2, then was too late (and flawed, early on) to catch the Windows party. Just as WordStar had been too late and too flawed to catch WordPerfect. Some kingpins in the industry just choked and faded away (Novell!) while others made it past the mistakes (Microsoft's early Internet forays, for example).
It was ever thus, and not just with computers. Canon changed its mount (FD to EF) to howls from professionals. Nikon played catch-up with digital. Some venerable brands faded or merged. Who would have thought... Sony!?,Panasonic!?