[Paladin2]

A brief reading of OS history has VMS having relatively common roots with Unix. You can look it up.

[jgorris]

And they both have MULTICS in their genes.
You can look it up.

[Mannaggia l'America]

A brief reading of OS history has VMS having relatively common roots with Unix. You can look it up.

I don't know about VMS having a lot in common with Unix.

But Windows NT (and therefore 2000, XP, and 2003) has some common roots with VMS.

The architect of Windows NT was Dave Cutler, who happens to also be the architect of VMS. Gates hired Cutler after he left DEC. There used to be a book available on Windows NT internals that points out the things the two OS's have in common.

Here's an article about the history.