I have just updated the OpenNTF project with a new version of the utilities. The new version puts the icon in the global toolbar and gets shown when you are in a mail or notes view and hides otherwise. This uses the org.eclipse.ui.actionSetPartAssociations extension to associate it with the various Notes Java views. I will be writing up a nice post on how to do that soon.
Pingback: Adding a dynamic global button to the Notes toolbar » Balfes.net