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Sync Mailboxes Over a Forest Trust

I am able to move mailboxes using PS commands, but on a higher level I was wondering if it's possible for both email servers to send/receive email for the domain while I move mailboxes. Thus, I could move them in phases instead of having to move them all at once. I am not sure how to do this while keeping it all synced.

Thanks.
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LCNW
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LCNW
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abhaighCommented:
Are you migrating from one org to another? or within the same org?

If you are wanting to have two exchange orgs share the same smtp namespace during the migration, and wanting to maintain onnectivity between the migrated and non-migrated mailboxes you might want to read these

http://support.microsoft.com/kb/321721
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_23185658.html
http://www.msexchange.org/tutorials/Exchange-2003-SMTP-Namespace-Sharing.html
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LCNWAuthor Commented:
I'm migrating from one org (Forest 1) to another org (Forest 2). I would like to migrate one department at a time, but that requires my old Exchange Server (2003) and my new Exchange Server (2007) to share the same public domain while the migration is in process. Is that what SMTP namespace sharing is? How would the internal emails be handled? I don't understand how the user A (Forest 1) would contact user B (Forest 2).
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abhaighCommented:
Yes, that is what SMTP namespace sharing is

Read the articles quoted, they'll explain everything

however the tl;dr version is this

set one system to be authoritative for the smtp domain - this will be server B, the last in the chain

server A, the first in the chain is non-authoritative and is configured to pass on all email it does not have a mailbox for to system B for final resolution

All mailboxes on server A are given a new, internal, smtp address

a new connector is configured on server B that controls the routing to that new internal smtp namespace that sends all mail sent to that address upstream to server A

as you migrate the mailboxes/users across - you remove the exchange properties from the accounts migrated and replace their entries in the GAL with new contacts using the new internal namespace - this ensures continued connectivity between the migrated and non-migrated users

once the migration is complete, you change your mail flow and remove the now-empty esrver from your topology

but read the docs I've linked - they go into more detail and should explain what is neccessary a lot better than I
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