Going to Windows Server 2003

I am looking for some advice on the best way to go to Server 2003  AD. Currectly we already have a windows 2000 AD environment in place with 2 DC's and an email server that is running exchange 2000. I remember reading somewhere on microsofts site that if you do an in place upgrade (i may be mistaken) to be careful since AD on 2003 has some changes that might corrupt or destroy the current 2000 AD while upgrading. I may be totally wrong or have my stories mixed up. But this is what I was going to do to upgrade:

Install a new server with windows server 2003, make it a DC and join it to our existing domain. Once everything has replicated to the new 2003 server then i will take the two 2000 servers out of the picture. Then later I will add Exchange 2003. What  issues or problems should i be aware of? Also is thier a utility to clean or check for corruption on AD?

Since there is no wrong or right answer that i am looking for I am assigning a point value of 250 and will split them up according to the suggestions i think will be best for the situation. Thanks for the help.
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My opinion would be this:

1) Upgrade to Exchange 2003 first.

2) Upgrade the domain to Windows 2003

Exchange 2003 can run in a Windows 2000 (sp3 or higher) domain.  So, I would basically install a new server into the environment as Windows 2003 (you will need to extend the existing Windows 2000 schema for this...).  The load exchange 2003 in the existing Exchange organization (you will need to extend the Windows 2000 schema to allow this as well).  Then move all of the mailboxes and public folders to the new Exchange 2003 server.  Then decommission the old exchange server.

Finally, you can perform an inplace upgrade to you domain controllers...

Here is a good document that shows the Exchange migration:  http://www.msexchange.org/tutorials/Migrating-Exchange2000-Exchange-2003-Hardware.html

After Exchange is moved to Exchange 2003, you can upgrade the domain very easily by running an inplace upgrade to Windows 2003.

msidnamAuthor Commented:
How do i extend the windows 2000 schema for 2003? And do i do this before or during the upgrade? I would do an in place upgrade but I am hoping to get new servers for this. Currently we have SP4 on our 2000 DC's.  
"How do i extend the windows 2000 schema for 2003? And do i do this before or during the upgrade?"  See the article I linked you to...this is all explained in the article...  It is explained very clearly and in great detail.

Basically, follow this article and implement it.

After you are done with the article, you will have Exchange 2003 working and you will only have to do an inplace upgrade of the domain (or swap out the DC's to new hardware)

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msidnamAuthor Commented:
Thanks for the help. The article looks great. But I can see I have my work cut out for me to make sure that 2003 will upgrade successfully. Thanks again.
Good luck...  The article is great....and has worked for me many times.  Just perform the steps...step by step.  And print out the links provided in the article.
msidnamAuthor Commented:
And a lot of links thier are :)

May I ask what you did in regards to the microsoft articles? Because I see in the microsoft link where it talks about the mangled attributes there is also a link on steps you should take to ensure the 2003 AD goes well. For example make sure all the hotfixes and service packs are in place, etc. But it also talks about making sure the AD is replicating correctly. I know in the articale it talks about using REPADMIN to make this happen. But what else can i do to ensure that the AD is replicating correctly. Let me know if i should post another question and i will to make sure you get additional points if you would like. Thanks again.
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