The idea is to setup a samba server (LDAP backend) as the PDC for Windows XP/2000 clients. The main problem we see is enabling SSO for their Windows Applications such as Outlook, File Sharing Services (an another samba server or 2000 server). Do we setup OpenExchange to allow SSO? Or is it possible to use Samba/LDAP and Kerberize IMAP to allow this? How do we then tell the client, Microsoft Outlook, that SSO is in place?