To install CDO, go to Start>Settings>Control Panel>Add or Remove programs. With "Change or Remove Programs" selected, scroll down the list of currently installed programs, highlight Microsoft Office and press "Change" - this opens up Microsoft Office Setup.
Select the "Add or Remove features" radio button and press "Next".
Press the + button next to Microsoft Outlook
Click on the drop down list next to "Collaboration Data Objects" and select "Run all from My Computer".