>>You may be right since we're basically only using it for web apps which would always have access to IIS - good catch!...
>>>You can relay through another SMTP server, but I'm pretty sure CDONTS still requires IIS on the local machine to work...
>>>
>>>>Steve,
>>>>You should be able to relay thru a central IIS server with the SMTP service with CDONTS. We were being relayed thru by some 3rd party a while back without our knowing it :(, so, I'm pretty sure this can be accomplished.
>
>Windows 2000 server come with CDO installed as system component (not only with IIS).
>see http://msdn.microsoft.com/library/en-us/dncdsys/html/cdo_roadmap.asp

From the link over:

CDO 1.2.1 (CDO.DLL)
This library ships with Exchange 5.5, Outlook 98, Outlook 2000, and Exchange 2000 Server.

CDO 1.2 for Windows NT Server (CDONTS.DLL)
This library ships with Internet Information Server (IIS) 4.0 (Windows NT 4.0 Option Pack 1) and Windows 2000 Server.

CDO for Windows 2000 (CDOSYS.DLL)
This library is installed with Windows 2000 Server only.

CDO for Exchange 2000 Server (CDOEX.DLL)
This library is installed with Exchange 2000 Server.

CDO for Exchange Management (CDOEXM.DLL)
This library is installed with Exchange 2000 Server and consists of a set of objects for administering Exchange 2000 Server mailboxes and servers.

CDO Workflow Objects for Microsoft Exchange (CDOWF.DLL)
This library ships with Exchange 2000 Server only and provides a set of objects for creating workflow applications.

CDO References
For more information on the different versions of CDO, visit the Microsoft Knowledge Base (KB) and search for the following articles:

Q176916: "INFO: Active Messaging and Collaboration Data Objects (CDO)"
Q171440: "INFO: Where to Acquire the Collaboration Data Objects Libraries"
Q177850: "INFO: What is the Difference Between CDO 1.2 and CDONTS?"

HTH