IBM's biggest enemy was IBM
I remember fondly the 1995 CES in Las Vegas. Windows 95 was being heavily promoted but still eight months away from shipping and nearly everyone was making jokes about how late it was. IBM had a booth for its consumer software division. I spent some time there talking to a VP and noted that everything there was for Windows 3.x and none of it for OS/2 Warp. Not true, he said, all of it works in Warp. But only as Windows apps, not natively with any of the strengths OS/2 offers.
He looked at me as if I'd grown horns and opened a third eye. Native OS/2 software? We have to make money at this. There isn't any money in OS/2 software.
This was the man who lead IBM's effort to enter the market for games and educational software.
It was even worse in other divisions. They were openly at war with the PC guys, who they perceived as directly undermining their products. Microsoft didn't have to be a very good fighter when its opponent was constantly being attacked by members of its own family.
Another notable incident, from the Comdex about two months earlier at the same Las Vegas Convention Center. IBM proudly rolled out the latest version of its 'cheap' development package for OS/2. Only $600. The Windows SDK from Microsoft? They slipped the CD in your bag if you came within 50 feet of their booth and held still for a few seconds. By the end of that Comdex I had a dozen of those discs.
Microsoft really wanted it, while IBM wasn't sure if they really cared.