>>We have been successfully using CDO (cdosys.dll) against Exchange 2003 to send fully automatic emails. We are now installing Exchange 2007 and this scheme does not seem to work anymore. What's the alternative?
>
>I don't see why it shouldn't work with Exchange 2007. What seems to be a problem?

The system asks for authentication and refuses it. We have read somewhere that "Exchange 2007 does not support cdo functionality" anymore:

(quote)
Use Windows Workflow Services (WWS).

MAPI client and CDO 1.2.1 on the Exchange installation


Exchange 2007 no longer depends on these components. They are a separate component that will be available for download.
(unquote)

in http://www.petri.co.il/exchange_2007_discontinued_features.htm