Joining new Exchange 2003 Server to existing Exchange 2000 environment

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Greetings Everyone,

I had a question regarding the setup/design of an additional Exchange
Server, which will be an Exchange 2003 Server. Currently we have one Windows
2003/2000 Domain with one Exchange 2000 Server SP3 on an Advanced Server
2000 Box SP2. We have approx 200 mail enabled users that are receiving all
email from our exchange 2000 Server and have two W3K Domain Controllers that
are acting as Global Catalog Servers.

We are introducing a brand new DELL W3K Server Standard with Exchange
2003 Enterprise Ed.(Which will be installed by our Department) into our AD
and will become our primary email server.

I'm not doing an direct upgrade on the existing box so I am somewhat
confused on how both exchange servers will coexist for this process.
My questions is how to go about the following:

1. When I install Exchange 2003 server onto the new box and into the
organization, Do I join and existing organization or create a new one? Our
goal is to retain as much as possible to make the migration/upgrade very
transparent to anyone and to eventually decommission the old Exchange 2000
Box.
2. How to transfer all mailboxes,data, users and relevant information to the
new server.
3. I know I would have to do a Forestprep and Domainprep for the W3K Server,
but how would I deal with administrative groups?

Ultimately, the first Exchange 2000 Server will be taken offline after the
new one is fully functional and ready to assume the role.
Your help is sincerely appreciated and thank you for your time.

David Leonardi

Additional Information

One Domain
One Forest
AD is running in Native Mode


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