Description :
Non support des CDO avec Outlook 2010.

Solution :
http://blogs.dovetailsoftware.com/forums/thread/12374.aspx
First you need the following files from a working install of CDO 1.2.1. These are located on a x32 OS at C:\Program Files\Common Files\System\MSMAPI\1033 and on a x64 OS at C:\Program Files (x86)\Common Files\System\MSMAPI\1033.
CDO.DLL
GAPI32.DLL
License.rtf
On a computer that already has Office 2010 installed copy the above three files to C:\Program Files (x86)\Common Files\System\MSMAPI\1033 for a x64 OS. If you are working with a x32 OS place them in C:\Program Files\Common Files\System\MSMAPI\1033. You should already have a file named MSMAPI32.DLL located in this folder that was installed during the Ms Office installation. Leave it alone. Now open a Command Prompt from the Accessories start menu group by right clicking and choosing Run as administrator from the context menu. This is very important. If you do not run as administrator registration will fail due to lack of permissions. From the command prompt navigate to the path where you placed the three files and type regsvr32 CDO.DLL and enter. Now launch Dovetail and setup and test your CDO installation.
I took this one step farther. Since we have a number of users all over the world and more than just Dovetail that utilizes CDO I created an installer using Visual Studio 2010 so the end users could install this without intervention from the IT staff. You could use any installer program to create an .msi file just remember to set CDO.DLL to self register. In Visual Studio this is vsdrfCOMSelfReg.