Converting User Mailboxes to Linked Mailboxes

Question

We're going to be moving users to a new, trusted domain and want to keep our Exchange 2013 server in the old domain. It looks like the best strategy for us is to convert our user mailboxes to linked mailboxes for users who will log into the new domain.
There's quite a bit out on the web on doing this in Exchange 2010 but I don't see anything specific to Exchange 2013. Is the procedure basically the same? This is what users seem to be doing from PowerShell:
Set-User <userID> -LinkedMasterAccount  AccountDomain\UserID  -LinkedDomainController AccountDomainControllerFQDN
Orange County District Attorney

Answer 1

Hi,
If you want to convert the existing mailbox to a linked mailbox, we can do the following steps:
1.To disconnect the mailbox object in the Exchange store from the user object in Active Directory, for example.
Disable-Mailbox -Identity User1
2.To create a credential object, run the following command.
$cred = Get-Credential
You will be prompted for credentials. Specify an account that has permissions to access the domain controller in the forest where the user account resides. Use the LinkedDomainController parameter to specify the domain controller. This domain
controller obtains security information for the account to which you are linking the mailbox object.
3.To reconnect the mailbox object in the Exchange store to an external user object, use this example.
Connect-Mailbox -Identity User1 -Database "Mailbox Database" -LinkedDomainController FabrikamDC01 -LinkedMasterAccount [email protected] -LinkedCredential $cred
For more information about converting linked mailbox, please refer to:
https://technet.microsoft.com/en-us/library/bb201694%28v=exchg.141%29.aspx?f=255&MSPPError=-2147217396
Regards,
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Winnie Liang
TechNet Community Support