From memory, the file server is in kernel mode, the LDAP/Authentication goop, DNS, WINS, DFS and printer servers are separate user mode services while named pipes/rpc/mailslots are spread between both.
While not having a great depth of knowledge about Samba-the-software or Samba-the-prokect I'd imagine there is slightly more to the story. The note that Samba has two conflicting "markets" is very true: enterprise v consumer/SMB/embedded.
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