CDO is not supported for managed code at all. It causes memory errors and
other problems.

Are you using a manifest file for your addin for Vista? Can you run in debug
mode on Vista? Are you strong naming your assemblies? Are all prerequisites
and requirements installed on that Vista system? Are you using a shim or
using the default shared AppDomain?

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm


"Mike" wrote in message
...
Also, one more thing, this is NOT a VSTO addin.

"Mike" wrote:

Hello. I have an addin that works fine on XP/Outlook 2007, but once we
install it on Vista, it won't load in Outlook 2007. Looking in the
Tools --
Trust Center -- Addins, etc., I see the generic message "Not loaded. A
runtime error occurred during the loading of the COM Add-in."

How can I further troubleshoot this error? I see no logs being
generated,
nothing in the Event viewer, etc. How can I determine the cause of this
problem?

I also already tried installing CDO, but that didn't help either.

Thanks in advance for any help provided.