[Samba] passwd syncing?

[James]

Can Samba provide a central service for mapping or syncing username and
password across different applications
for example AD users accounts and Lotus Notes "ClientID's" ... (something
just shy of a metadirectory service)

I've used Samba in a past life do something simular and sound like Samba has
matured significantly.
any thoughts ... or am I hunting down the wrong hole
-james