Multitasking MS-DOS 4.00 internal revision 4.11
| Build of Multitasking MS-DOS 4 | |
 | |
| Architecture | x86 16-bit |
|---|---|
| Compiled | 1985-05-28 |
Multitasking MS-DOS 4.00 internal revision 4.11 is a beta build of Multitasking MS-DOS 4, which was compiled on 28 May 1985. This build was sent to a person called "Phillip" (who appears to be a Microsoft partner or at least in a position to receive beta releases of this OS) by an unknown party on 7 August 1985, and then uploaded to a warez BBS on 2 April 1987. This BBS was backed up, and the build was recovered from the backup and released on 23 June 2024 (with numerous other builds of various Windows and MS-DOS versions as well as games).[1]