We are implementing the FIM Outlook plug-in for Outlook 2007. We would like to disable the ability for a user to use the global address book to manage groups and to only us the FIM plug-in. We believe we can prevent users from managing groups via the GAL via group policy but require the control id of the "Modify Members" button displayed below in the image. Does any one know the control id for this button or how to obtain it or a different approach as our understanding is that we should not allow users to manage distribution list both through the GAL and the FIM plug-in. Thanks for your help!