Questions about LDAP, Heimdal and 2003 Server

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Sorry for my question but I've one big question about LDAP / Heimdal and
Windows 2003 Server.

I find answers on google but a prefer to questions professional.

Is it really possible to have one Windows 2003 Server with OpenLDAP database
for user and Kerberos (Heimdal) database for passwords ?

Actually I've one big architecture (about 2000 FreeBSD clients with OpenLDAP /
Kerberos) and a little arch with 150 Windows XP in a Windows 2003 domain. It
must be more simple if my AD was based on the LDAP and Kerberos structure I
used for my Unix clients..

Thanks for your answer !