We have several distribution groups that we hide the membership of through Exchange Tasks. In AD, if they are hidden you can't see who belongs to that group. However, I found a disturbing problem. I logged in as a generic user and went into the Exchange Address Book. I opened up a contact and was able to view what distribution groups the person belonged to, including the ones that were supposedly hidden from view. Does anyone know of a way to hide the membership of certain distribution groups in Exchange? My clients are on Outlook XP for the most part and I'm running Exchange 2000 with all the SPs installed. eric