We are having a problem where a user cannot add people to a distribution group. He has been added to the "Managed by" group in Exchange Management Console for the distribution group in question. There are four total owners(users added to the "Managed by" group), however when I view the group from the user's global address list, it only shows one owner. Perhaps that is simply the creator, although it says "owner". I have personally tried logging in as the user and adding or removing a member will not work.
Thanks for any help.