Simultaneously with Windows 3.1's release, IBM started shipping OS/2 2.0. The latter strategy was to develop a 32-bit underlying kernel and filesystem with 32-bit protect mode device drivers in Windows for Workgroups 3.11, to be used as the basis for the next version of Windows, code named "Chicago." Cairo would be Microsoft's next-generation operating system based on Windows NT featuring a new user interface and an object-based file system, but it was not planned to be shipped before 1994 (Cairo would never be shipped, however, although elements from the Cairo project would eventually ship in late July 1996 in Windows NT 4.0, without the object-based file system, which would later evolve into WinFS). At this point, Microsoft's strategy was to have a next generation, high-end OS based on Windows NT, namely, Cairo, and a low-end, consumer-focused one as an evolution of Windows 3.1. At this time, Windows for Workgroups 3.11 and Windows NT 3.1 were still in development. The initial design and planning of Windows 95 can be traced back to around March 1992, just after the release of Windows 3.1.
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