Migrating Samba/LDAP from Linux to OSX Server

Hi all. I've inherited a fairly "pure" implementation of OpenLDAP and Samba 3.x, running on a Debian server. While it's stable enough, making user changes is not terribly easy, and involves using LDAP and then smbpasswd, for example. I can manage this well enough myself, but for political reasons (mainly having to do with the "beer truck" theory of information loss), I'd like to standardize on something somewhat more intuitive. Additionally, I want to set up some groupware, etc, and haven't found much joy with most of the offerings out there. As far as resources, I've got one fairly nice PowerEdge that stores roaming profiles for windows users, as well as the LDAP server. I've got a second server for DHCP (no DNS), and did I mention no DNS? My third server is for mail. And then I've got an XServe that I can install Tiger Server on. Here's what I'd like to be able to do:
* Make the XServe the PDC, and demote the existing linux PDC to a BDC role.
* Use the existing LDAP server if at all possible, or setup mirroring between the two.
* Keep the user profiles and other assorted directories on the linux machines where they are currently.
* Move the entire domain, all user and machine accounts, etc. onto OpenDirectory.
* Do this without causing noticeable disruption to my userbase - I will have the opportunity to do the migration during a holiday week where not many people are around, but I don't want to rebind every stinking computer to the domain.
* Earn the respect and adulation of my peers, and have them buy me free coffee forever.
I've paged through the "Migrating to Mac OS X Server from Windows NT" PDF over on the Documentation page, and some of it looks useful, although a lot of it looks pretty specific to defenestration, whereas my project is more like a penguin demotion. The stuff I'm most concerned about in this respect is keeping the file shares where they are, dcpromo, and using the extant LDAP server.
Also, I'm wondering how beefy an Xserve I'd want to have to do the user auth piece. I'm currently supporting about 140 users and about 250 machines, although the user count will jump to around 800 when I create accounts for the secondary students.
Thanks!

agostini,
I've successfully moved users off a similar setup (Debian Linux, Courier IMAP, SquirrelMail) to my new Xserve. I used imapsync-1.239
http://www.linux-france.org/prj/imapsync/dist/
(it's about halfway down the page - Dec 2007 release)
I initially tried using the MacPorts install of the same version, but it constantly failed to authenticate with the Xserve. I have my Xserve setup for always using CRAM-MD5 auth. (Make sure you have all of the Perl MD5 modules install, including the optional ones, if you use MD5 auth). So, I downloaded it and compiled it directly. This eventually worked and with only a couple of bad emails, out of thousands, that did not transfer. It also will retain flags set on the previous server (seen, replied, etc.). I ran it from the Xserve and connected to the Linux box remotely.
I have no experience with Qmail.
If you use procmail on the Linux machine though, you will need to recreate those scripts as sieve scripts on the Mac. I found the SquirrelMail plugin for sieve scripts most helpful.
Larry

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Message was edited by: agostini
Message was edited by: agostini
Message was edited by: agostini

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