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June 1991 – To promote OS/2, Bill Gates took every opportunity after its release to say ‘DOS is dead’; however, the development of DOS 5.0 led to the permanent dropping of OS/2 development.
This version, after the mess of version 4, was properly tested through the distribution of Beta versions to over 7,500 users. This version included the ability to load device drivers and TSR programs above the 640 KiB boundary (into UMBs and the HMA), freeing more RAM for programs. This version marked the end of collaboration between Microsoft and IBM on DOS.