MS-DOS 4.00 (1985)

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MS-DOS 4.00 Multitasking Edition
Version of MS-DOS
Release date1985

MS-DOS 4.00 Multitasking Edition is the once hyped future of MS-DOS, that Microsoft shelved in favor of OS/2 and IBM's regular DOS 4.x. It was a parallel project to DOS, never released to the regular consumer market, and Microsoft backtracked to base its next consumer release off of DOS 3.3.[1] It was only released by some OEMs in Europe, which is why it's also referred to as "European DOS 4.0".