AD group delegates need access to Private Items

I have a group of Admins that would like access to all Private items in all of the conference room calendars. These calendars are setup as user accounts. I have created a group in AD for the Admins and assigned the group as a delegate. The box is checked to allow delegates to view private items; however, the private items are still not viewable. Any ideas?

Using Outlook 2003 and Exchange 2003