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Microsoft just released the source code of one of its most important computer operating systems. The catch is that the software is over 30 years old.
Yesterday, with permission from Microsoft, Silicon Valley’s Computer History Museum published the source code for MS-DOS, the text-based operating system that ran so many personal computers in the ’80s and turned Microsoft into one of the industry’s dominant software companies. For computer geeks, the move can provide a bit of fun — a glimpse into how software was built in the past — and it provides a nice metaphor for a Microsoft that’s evolving with the times. Microsoft was once vehemently opposed to open source software, believing that it would cut into its core business, but in a modern world where open source is so very important, the company is changing its tune.
30-years is a reasonable time to keep proprietary software locked down.