OS/2 the future — Microsoft's involvement in IBM's OS/2 project ended before v2.0 was released. Enlarge / This big, weathered box contains an oddball piece of PC history: one of the last builds of IBM's OS/2 that Microsoft worked on before pivoting all of its attention to Windows. In the annals of PC history, IBM’s OS/2 represents a road not taken. Developed in the waning days of IBM’s partnership with Microsoft—the same partnership that had given us a decade or so of MS-DOS and PC-DOS—OS/2 ...