Connection to a SAMBA Active Directory

I have a new client who wants me to install an Exchange server in their
infrastructure. They currently have a simulated AD using Samba to front end
a Linux-based LDAP directory. They have about 50 XP Pro workstations that
log into the domain. There are also 2 Windows member servers in the domain.
In addition, they have about 5 Macs and 10 Linux desktop machines.

Does anyone have experience in this area. Will I be able to install an
Exchange server in the existing infrastructure? I figure I have 3 options.

1. Install Windows 2003 Server. Join the existing domain. Install AD on the
new Windows 2003 Server. See if it replicates. Try to install Exchange 2003
Server. If the domainprep and forestprep work, then everything should be OK
(theoretically).

2. If the above fails, install Windows 2003 Server, create a new domain. See
if I can create a 2-way trust between the SAMBA domain and the new domain.
If that works, then proceed with Exchange installation and migrate accounts
over via ADMT.

3. If 2 fails, install Windows 2003 Server, create a new domain. Create new
accounts on new domain either manually or via LDIF export from existing
LDAP. Have users give new domain credentials when they launch Outlook or
Outlook Web Access.

Am I on the right track? Does anyone have any different or better ideas?

Thanks.



.

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