I am stuck in my migration from Windows 2008 SBS to Windows Essentials 2012 with an on premise Exchange 2013 server. I have installed my new Essentials server and my new Exchange 2013 server (both or created in VMware on separate hardware from the SBS 2008 server). My problem now is OWA and removing the Exchange 2007 server.
I see through posts and comments that the ARRconfig command that I need to run as a part of the rerouting of mail.domain.com for OWA access won't complete successfully until the Exchange server is integrated with the Essentials server which won't complete successfully until the Exchange 2007 server is uninstalled.
I have migrated the mailboxes to 2013 and the public folders to 2013 but now when I try and uninstall Exchange 2008 it hangs on moving the OAB. The error I get is
Failed to create the 'ExchangeOAB' folder on the target server 'PPM-EXCHANGE'. Two possible reasons for the failure are that the System Attendant Service is not running or you do not have permission to perform this operation. Error message : 'Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))'.
Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))
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