Please verify that the following DLL is present and registered using regsvr32: For systems with Exchange installed, please verify CDOEX.DLL, otherwise use CDOSYS.DLL.
I don't have knowledge/experience in Exchange. Below information is from MS, and I have listed the appropriate links from MS for additional information on CDO's. Hope this will help resolve your situation.
CDO for Windows 2000, sometimes referred to as CD0 2.0 or CDOSYS.DLL, is designed to provide an object model for the development of messaging applications on Windows 2000. CDOSYS is based on the Simple Mail Transfer Protocol (SMTP) and Network News Transfer Protocol (NNTP) standards and is available as a system component on Microsoft Windows 2000 Server installations. It is the standard API for building bulk-mailing/Web-based messaging applications on Windows 2000 Server.
CDO for Exchange 2000 (CDOEX.DLL) is installed with Exchange 2000 Server. CDOEX upgrades the registration for the CDOSYS component to CDO for Exchange 2000. Many of the features not included with CDOSYS, that is targeting the Web Storage System development, are available with CDOEX. Application compatibility for CDOSYS applications is preserved since the CDOEX library is a pure superset to CDOSYS.
Navigate to c:\Program Files\Common Files\Microsoft Shared\CDO. Verify if the CDO is CDOSYS or CDOEX. You need to register CDOEX.DLL as shown below.
regsvr32 cdoex.dll, else register CDOSYS.
Check the below links for further information.
support.microsoft.com/default.aspx?scid=kb;EN-US;171440
msdn.microsoft.com/library/default.asp?u.../msexchsvr_cdoex.asp
msdn.microsoft.com/library/default.asp?u...html/cdo_roadmap.asp
support.microsoft.com/kb/200018/
