OS/2 was a joint project of IBM and Microsoft with IBM working on the kernal and Microsoft working on the GUI. Microsoft bailed out when IBM would not incorporate the GUI into the kernal for stability reasons. The early versions of OS/2 and Windows OS/2/NT, which is what Microsoft called their version, were able to run each other's applications.
Microsoft dumped the vastly superior High Performance File system to create incompatibilities with IBM and kill this interoperability, but they kept the GUI in the kernal and they kept the resulting "Blue Screen of Death".
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