Move a domain between a 2000 Native Forest and a new 2008 native forest

At present I have two forests, let's say "old_forest" and "new_forest".

old_forest is a Server 2000 native forest with one domain.
In this domain is an Exchange 2003 organisation

new_forest is a Server 2008 native forest with one domain.
In this domain is an Exchange 2010 orgaisation.

I would like to be able to migrate users between the mail servers without affecting the user profile on the client desktops, so without joining the PC to the new_domain in new_forest. There are shared resources on old_domain in old_forest that I would need access to for users in the both the old_domain & new_domain (in new_forest).

Talking this around with my collegues, the ideal situation would be for users to remain on the old_domain (maintaining the desktop profile) but their mailbox/mail profile be on the server in the new_domain in the new_forest.

Eventually, the old_domain and the old_forest would be removed altogether as all new users will be added to the new domain.

I hope this makes sense! Please ask as many questions as you need!
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This should be possible, but I do see one issue. Since this is happening across two distinct forests, your users will need a seperate login to access their emails as they would with the resources in their domain. While they can set the passwords to be the same, the policies surrounding this (ie. expiration periods) will be different. Is there a specific issue your having/expecting?

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chrislewissecurityAuthor Commented:
Thank you both. I shall read those articles and get back to you.
chrislewissecurityAuthor Commented:
The Generation V artcile is great.

Can any one help step me through the routing part of that article?

How do I create the proxy addresses on each Exchange Server so that I can set up routing to enable both forests to be authorative for the single SMTP name space?
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