what OS is the article about?
Unix
what is it?
a family of multitasking, multiuser computer operating systems
where did it come from?
the original AT&T Unix
when did they let other work on their OS?
in the late 1970s
are there different versions?
Yes
how do they differ?
some are academic and others commercial
who released some versions?
the University of California, Berkeley
what was their flavor named?
(BSD)
who else?
Microsoft
what did they call theirs?
(Xenix)
anyone else?
IBM  and Sun Microsystems
what were their flavors named?
(AIX) and (Solaris)
who bought the rights to from the phone company?
Novell
when?
in the early 1990s
did they resell it?
Yes
when?
1995
who bought it?
SCO
is that an acronym?
Yes
what does it stand for?
the Santa Cruz Operation
as of 2014 which flavor has the largest install base?
Apple's macOS