Multitasking MS-DOS 4.00 4.00

Multitasking "MS-DOS 4.00" is a developmental version of MS-DOS that was never released to retail consumers. It was eventually licensed to some companies for internal use. Development started in parallel during the DOS 2.x days, and was intended to be the successor to MS-DOS 3.x. It would have competed against Digital Research's Concurrent DOS.

Microsoft shelved the product in favor of OS/2. However as OS/2 adoption was slow, IBM extended the existing MS-DOS 3.x to create IBM's DOS 4.0x, which Microsoft released as the actual MS-DOS 4.00 product.

As such, Multitasking MS-DOS 4.00 and the actual MS-DOS 4.00 release are not directly related.


Product type
OS
Vendor
Microsoft
Release date
1985
User interface
Text
Platform
DOS
Download count
9 (9 for release)

Downloads

Download name Version Language Architecture File size Downloads
Multitasking MS-DOS Version 4.00 (5.25) 4.00 English 187.78KB 7
Multitasking MS-DOS Version 4.00 (Beta 5-29-84) (5.25-360k) 4.00 (Beta 5-29-84) English 112.93MB 2

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