Microsoft Open Source Programs Office News Today

Microsoft has open-sourced MS-DOS 4.0 under the MIT license, making it nearly 45 years after it was first developed by Microsoft and IBM.

Microsoft has announced that it is open sourcing MS-DOS 4.0, in collaboration with IBM, who developed portions of the code.

Ten years after releasing the source code of MS-DOS 1.25 and 2.0, Microsoft is making yet another contribution to the world of open-source software preservation. Working in...

See the canonical version of this blog post at the Microsoft Open Source Blog! ...

DOS 4.00 was supposed to add multitasking to the OS, but it was not to be.

Microsoft, in partnership with IBM, has released the source code of MS-DOS 4.00 under the open-source MIT license. This release comes a decade after Microsoft first made the source code for MS-DOS 1.25 and 2.0 available to the public through the Computer History Museum.

How did the operating system so bad it likely steered users to Linux 35 years ago come to be open-sourced now? Here's what happened.