A. Collaboration Data Objects (CDO) scripts run with Microsoft IIS, so you must have IIS configured correctly. Make sure the IUSR_server account has log on locally access. If you've never installed Outlook Web Access (OWA) on your server, you might need to manually register the CDO DLL with the system. To do this, type the following command:
regsvr32.exe c:\winnt\system32\cdo.dllThen stop and restart the Microsoft Exchange Event Service on your Exchange Server system.