Can someone point me to a list somewhere that states which versions of Windows (client and server) ship with ICACLS? I need to know going back to approximately the Windows XP era, and unfortunately don't have access to baseline images (someone may have manually put ICACLS on the machine if it did not have it).
No, ICACLS is not available in Windows XP.
ICACLS ships starting from Windows Server 2003, i.e., from Windows Vista era onwards.
For previous versions of Windows such as XP, use CACLS instead.