[henry]

that explains why it does not work.
After clean install of Outlook 2007 this directory should contain only
MSMAPI32.DLL.
So all these files are from older version of Outlook. So something went wrong when you upgraded to Outlook 2007.

So you need to reinstall Outlook 2007.
Uninstall ZCO.
Uninstall Outlook 2007.
Remove this directory (backup it just in a case).
Install Outlook and install ZCO.