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help in migrating to a shared exchange server

I have moved several clients from a dedicated exchange server, to a shared exchange server with mailtrust.  I have a few problems with people replying to messages that existed before the migration.  When a user tries to reply to a message, that was created in the same domain, created before the migration, there are errors about delegation and messages get bounced back.

On the old server, it looks like there was never a smtp email address entered in the way Exchange routed mail.  It looks like it was just sent to the AD object.  

1. Is this always normal for when you migrate to a new server that is not using the same AD structure, or should there be a smtp address that would prevent this?

2. I was told that you can use legacydn to migrate the old information to the new server to prevent this issue.  Mailtrust has said that they would do this, but I am not farmiliar with the process.  Any one have any suggestions and links where I could find info on how to do this?
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ryan80
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ryan80
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aa230002Commented:
As i gave you the steps in my previous post on other question, i am providing you the MSKB link here -> Hope it will help.
http://support.microsoft.com/kb/555197

-Amit Aggarwal.
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ryan80Author Commented:
Ok, thanks for the link. So i really dont need a specific tool to do this.

Is this always a problem when you move to a different server?
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aa230002Commented:
yes. as reply to will always go to the legacyExchangeDN which is organization specific. If you are moving to a new organization, you need to note down the legacyExchangeDN of the user before the migration so that you can put it as a X500 address on the new user in the new organization for others to reply back to your old emails.

-Amit
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