Ghys,

did you run the smbpasswd -w <LDAPQUERYPASSWORD> command (replacing the <> with the actual password for your windows ldap user)?

Also did you try changing your ldap.conf file to:

binddn LDAPQUERYUSER@myplace.com

instead of:
dn="cn=LDAPQUERYUSER,cn=Utilisateurs,dc=domain,dc= com

Are you able to SU to a Windows user? If not, what's the error message when you run the command.

Also, does the Windows user you are SU'ing to have a gid number set in Active Directory under the Unix attributes tab that should have been enabled by installing the Services For Unix (SFU)?

What happens when you use this command: id <windows-user-with-Unix-Attribs-Enabled> ?

If you want to include your config files I could take a look. Also, double check to ensure all required packages are installed (e.g., nss_ldap).

Shannon