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Microsoft releases MS-DOS 4 source code on GitHub — 45 year old code now open-source
(www.tomshardware.com)
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this post was submitted on 26 Apr 2024
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But not 5.0 yet - they still got critical proprietary stuff in EDIT and SMARTDRV.SYS that they don’t want their competitors to get a hold of.
I wonder if they licensed the source of 5.0+ to someone and are still getting paid for it. If so, it's probably something ubiquitous and critical that nobody would think of like traffic lights or water treatment plants.
I think that is likely since 3.3 wasn't included either and that is one of those versions people stuck with for ages.
According to people who are way more interested in this than I am, there was a bunch of licensed software in 5 and 6.