I’ve built a virtual museum with nearly every operating system you can think of

I can't figure out how to find a list and I believe that's intentional to avoid simplistic copyright search and takedown type of problems. It is aggravating how little information is available on the website.

1) I run my own systems in emulation and its always educational to see how other people handle configuration and sysadmin type problems. Much like programmers reading other programmer's code for educational purposes.

2) I have a genuine philosophical question which it appears I cannot answer by any means simpler than running it and trying it. Similar to the halting problem LOL. I wonder how the project handles operating systems like MVS/360 where there exists a perfectly good 1960s installation (which I have installed by hand from tape for the experience) however no one uses that IRL because the various MVS Turnkey projects provide seemingly infinite debugged and dependency organized patch sets. There's quite a difference between trying to white knuckle a homemade bare basic MVS/360 from the 1960s vs "MVS Turnkey 4" which basically just works out of the box.

Another example of #2 above is there's DEC PDP-8 OS-8 which technically boots... but the most common distro had a non-working but trivially fixable FORTRAN compiler (IIRC the runtime package filename was wrong or something similar). There's a lot of fun customization.

Another example of #2 above is I wonder how the author handles RSX-11M, distribute the ancient unpatched unmodified OS from DEC or ship something like the Billquist distro, or does the author ship the PiDP-11 RSX-11M (or is PiDP-11 shipping the Billquist RSX-11 distro now?)

I guess for people not into retrocomputing it would be like claiming some rando RedHat .iso from the 90s is "The" Linux operating system. Well, its "a" linux from one instant in time... Likewise there seems to be no "The" MVS/360 operating system there's a zillion possible local installs of all capability levels and eras, all very different and fun.

I had to Google and it does look like it, I remember the computer would boot into it and it also had space for a few (three?) icons outside the tabs (like in the “desktop”). It was a cool interface!

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That wasn’t an operating system. https://en.wikipedia.org/wiki/Microsoft_Bob:

“Microsoft Bob was a Microsoft software product intended to provide a more user-friendly interface for the Windows 3.1, Windows 95 and Windows NT operating systems, supplanting the Windows Program Manager.“

Some of these are runnable in the browser, for example here: https://copy.sh/v86/