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I'm attempting to migrate mailboxes from an Exchange 2003 server in one domain to a new Exchange 2010 server in a different domain, my understanding is I can achieve this using

New-MoveRequest -Identity 'address' -RemoteLegacy

However I'm receiving the following error "Active Directory operation failed on remoteFQDN. The supplied credential for 'NT AUTHORITY\SYSTEM' is invalid." I've checked the the credentials several times and they are correct, the credentials I'm providing are the Administrators, I've tried domain\Administrator, FQDN\Administrator, Administrator@FQDN and on a longshot just Administrator.

A Bit more about the setup...

We'll call the Exchange 2003 box mx.Fabrikam.local with a public facing of And the Exchange 2010 box exchange.Contoso.local

I've successfully prepared the mailbox for a cross forest move using

Prepare-MoveRequest.ps1 -Identity -RemoteForestDomainController -RemoteForestCredential $RemoteCredentials -LocalForestDomainController exchange.Contoso.local -LocalForestCredential $LocalCredentials

However now when I attempt The following new-moverequest I receive the error above.

New-MoveRequest -identity -RemoteLegacy -RemoteGlbalCatalog mx.Fabrikam.local -domaincontroller

I'm guessing I've missed configuring something on the 2003 server but not sure what. I've made sure the user account in AD has inheritable permissions box under advanced security settings checked, I've tried other administrator accounts, and a different mailbox, but receive the same error each time.

There isn't currently any trust between the two forests but I couldn't find anything saying that a trust was required, am I just missing this?

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