CDO = Collaboration Data Objects.
It is Microsoft's technology for building messaging or collaboration applications
or adding these capabilities to existing applications.
For example, when we combine ASP (Active Server Pages) with CDO, we can write a
web application that uses CDO to exchange emails (both read and send capabilities),
schedule meetings, view calendar schedules etc.
How to install:
For web servers, install MS Exchange Server 5.5 and ensure OWA is
For other workstations and non web servers, installation of MS Outlook
will automatically add CDO.
cdo 1.2.1 library is cdo.dll cdohtml.dll
cdo for nt/w2k is cdonts.dll cdosys.dll
Note: This article needs review to make it more up to date.