UNIX was designed for collaboration rather than security. The permissions, the (originally) open password file, sticky bits... it was full of security holes. Big ones. The engineers closed those holes after the fact when the internet started opening UNIX machines to the outside world.
NT actually has an enormous edge on security because of its roots in VMS rather than in UNIX, since as gaius pointed out, VMS places far more of an emphasis on security than UNIX did until the internet made it necessary.
NT actually has an enormous edge on security because of its roots in VMS rather than in UNIX, since as gaius pointed out, VMS places far more of an emphasis on security than UNIX did until the internet made it necessary.