Thanks to both of you for posting
Originally Posted by Escorts
1) Validate that after Microsoft Outlook 2010 has been removed that the MAPI32.dll is present in C:\Windows\sysWOW64 folder. If not, that specific file can be copied and pasted from System CD/DVD of operating system or from another Windows Sever 2008 not being impacted with this issue.
It looks like this may have been the final piece of the puzzle - I moved the cdo.dll to sysWOW64 and registered it, then everything started coming together - before then I had only tried in system32. Thanks!