Found it!

EXEC sp_addlinkedserver 'ADSI', 'Active Directory Services 2.5', 'ADSDSOObject', 'AD Provider'

grant select on corpsysad_allusers to public

select * from corpsysad_allusers

create view corpsysad_allusers as

SELECT name

FROM OPENQUERY( ADSI, '

SELECT name

FROM ''LDAP://163.232.12.200/CN=Application Users,DC=ppl2kdv''')

where ppl2kdv is the root node of my AD (others may include the complete .com.au or whatever, if so, your need DC=com, DC=au for example. Check this via the AD Maintenance GUI on your server. CN is for container, OU is for org unit.