Is there a way to configure Exchange to not require machine account validation when attaching via MAPI RPC?
If you are connecting to a mailbox on an Exchange 5.5 or Exchange 2000 server make sure that the Network Security option on the Security property tab is configured to allow NTLM (NT LAN Manager Authentication) in some way. If it is set to Kerberos only, then that could explain why you keep getting an error too. That is because Exchange 5.5 and even Exchange 2000 servers require NTLM authentication. Only Exchange 2003 supports Kerberos only.
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