I solve partialy my problem.
I use a Windows Server 2003 with file sharing.
1) Add the server the same way you add an XP client computer in the OD domain.
2) Create a file sharing using the server admin console (DO NOT USE the file sharing on the properties of the file) choosing full access for admin and read/write access for users
3) In the security of the shared directory add the OD admistrator’s (be careful domain_name\domain_admin not only domain_admin) and give him full access.
So apparently the PDC and the SMB doesn’t work correctly in Leopard Server apart for the file /Users/Profiles.
It works more or less fine.
Now, I want to hide the home’s and profil’s file to the other users (mac or windows).