...
-inactive <NumWeeks>    Finds users that have been inactive
                        (not logged on) for at least <NumWeeks>
                        number of weeks.
...

for /f "Tokens=*" %%s in ('dsquery computer -inactive 5 -limit 0') do (
DSMOVE %%s -newparent "OU=Computers,OU=Quarantine,OU=MyOu,DC=MyDomain,DC=local"
)

for /f "Tokens=*" %%s in ('dsquery user -inactive 5 -limit 0') do (
DSMOVE %%s -newparent "OU=Users,OU=Quarantine,OU=MyOu,DC=MyDomain,DC=local"
)