User mailbox converted on Linked Mailbox after migration from Exchange Server 2003
I was doing Exchange Server 2003 migration to Exchange Server 2010 and moved some mailboxes on Exchange 2010 server and after I noticed migrated mailboxes are recipient’s type is “Linked Mailboxes” which is not right, it should be user mailbox.
The reason it is showing as a Linked Mailbox is because the LinkedMasterAcount is set on mailboxes
To see the LinkedMasterAccount run this command “Get-User -Identity “user” | FL LinkedMasterAccount"
Run the following command “Set-User -Identity “user” -LinkedMasterAccount $null” This command will not have any output, but it will set the LinkedMasterAccount to null
To verify run the same Get-User command from above. I will be Blank, or should be.
The account will now show as a User Mailbox and not a Linked Mailbox. If you having bulk users you can use the Import-CSV Cmdlet to use a CSV as Input.
You can also use ADSIEdit with below steps:
Run ADSIEdit and find the account to be modified;
Clear the msExchMasterAccountSID attribute;
Change the msExchRecipientTypeDetails from "2" to "1"