The Collaboration Email Template Maps.xml file maps each of the email templates to an action. The file can be viewed and checked out of the object store from this folder:
[Object Store]\Root Folder\Collaboration Store\Collaboration Email Template Maps.xml.
See Example Collaboration Email Template Maps.xml file for an example of this file.
After editing the file, check it back into the object store using the Collaboration Configuration document class. Restart the Application Server and the Collaboration Engine to see the changes.