Vista KMS or Longhorn KMS??

I'm in the process of configuring KMS. I've installed a Longhorn Server to
act as a KMS host for the Vista clients. I've read that Longhorn is capable
of this. Except that I read one line which I don't really trust :

"Computers running Vista RTM require an RTM KMS to activate; beta versions
of KMS do not support activation of Vista RTM clients."

Does this mean the Longhorn KMS cannot support my Vista RTM Clients??

Any help is appreciated..