The problem with this method is that it removes all Exchange attributes, basically resetting them. The mailbox is in a disconnected state and until you re-attach the mailbox and re-apply Exchange attributes (email addresses just one example) you can potentially bounce mail.
Exchange 2010 SP1 has a new feature that isn't spoken of (infact TechNet documentation here still points to the above method!) This new command will automatically convert the mailbox to a linked mailbox without any disconnection or loss of Exchange attributes, and will automatically disable the account when applying the linked user.
Set-User -Identity Oliver@contoso.com -linkeddomaincontroller UserAccoundForestDC -LinkedCredential $(Get-Credential accountforestdomainadmin) -linkedmasteraccount Oliver@fabrikam.com
Try it, it works great!
Oliver Moazzezi MVP - Exchange Server
That is exactly what I was looking for. Great find!!! Thanks for the info.
Is this a supported way of converting a mailbox to a linked mailbox ?
Do you know if this command (convert) will be made available/supported in Exchange 2007?
I don't believe this cmdlet will ever be back-ported to Exchange 2007 i'm afraid.
Is there a way to do this for multiple mailboxes (i.e. bulk link mailboxes)? We plan on migrating mailboxes first and user accounts later and need to link moved mailboxes in the target forest back to the users accounts in the source forest.
You can have your users listed in a CSV and then make bulk changes with a For-Each statement.
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