Actually, call me daddy, but Microsoft was a VMS/Unix shop long before its DOS or Windows days. In fact, Windows was built using VMS systems.
VMS was ( I’m using the past tense because I haven’t worked with it for 7 years ) actually a GREAT operating system.
Robust and easier to use and understand than UNIX.
Last I heard, Hewlett Packard owns the OS.
I wonder how many companies are still using it...
I was working for a company that was MIGRATING AWAY from it.