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Exchange 5.5 to 2003 changing Domain

zreisman asked
Medium Priority
Last Modified: 2012-05-06
Ok.  I am in the process of Migrating from an NT / Exchange 5.5 Domain to Exchange 2003 in a AD Domain.     If I install the new Exchange 2003 server into the Exchange 5.5 site under the old NT Domain (Method 1: http://support.microsoft.com/kb/327928 ),

 how would I then migrate that Exchange 2003 server from the NT Domain over to the new AD domain?
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AD is required to install Exchange 200x.  You need to upgrade your domain first or create a new AD domain, install Exchange, and then migrate users and mailboxes using ADMT, Exmerge, etc.

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Great.  Thanks.  I knew that seemed too easy.   Possible to move the Exchange 5.5 server into the new domain?

It is probably possible, but not recommended.

Assuming that your NT domain is stable, this is what I would do.

Build a new NT domain controller for your domain (if your domain isn't huge, you can even use a workstation class machine for this).  Peform the steps necessary to upgrade your domain to 2003 using this machine.  Ultimately this machine will be removed so you don't have a 2003 DC that used to be NT.  Then, once your domain has been upgraded, build another 2003 server (server class machine) and promote it to domain controller.  Then move DNS over to the new machine and you can decommission the upgrade machine.

After that's all set, and everything is running smoothly, you can build the Exchange server.  Once it's in place, you can build the AD Site Replication connector to replicate to/from 5.5/2003.  

Once that's done, move the mailboxes, public folders, Schedule Free/Busy, offline address book, etc.

Once everything's moved, you can view the Remove First Exchange Server from an organization document on Microsoft's site to see how to remove the 5.5 server.

Note: this is not a comprehensive step-by-step list of instructions but guidelines.  Microsoft has documents on how to perform most/all of these steps.

If you were to create a brand new domain, then you have to use the ADMT to migrate users, permissions, etc. over and it just adds another whole level of complication.
Good luck!

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