I have to migrate from Exchange 5.5 (on NT) to Exchange 2003 (on Win2003). First I used ADC to move the Mailboxes from Windows NT to Windows 2003. When I try Join Exchange 2003 on 5.5, this error occur: "Setup encountered an error while attempting to bind to the Excahnge server "serverold" 0xC103FC93 The account that I'm using has administrator rights on Exchange 5.5. What can I do? Thanks.