If I remember correctly, you should be able to specify the ribbon visiblity
callback, which will be called each time a ribbon is shown.
You might want to post in microsoft.public.outlook.program_addins and/or
microsoft.public.developer.outlook.addins.

Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool

"Michael Tissington" wrote in message
...
I have implemented IRibbonExtensibility but how can I only load the ribbon
when the Outlook form is from a specific folder or message class (we have
an ECE that does this for pre 2007)

The RibbonID does not seem to reflect the actual message class.