This one had me stumped for a while.
Windows 2008 64bit
ASP Site using cdosys
Trying to send with CDOSYS in ASP or ASP .NET and the following kept appearing:
File name or class name not found during Automation operation
Turns out that this is related to the 32bit version of cdosys.dll not being registered within the syswow64 folder!
Hope this helps people out there 🙂