Group details in Windows Mail

I have a large mailing list (800+) - most contacts are allocated to one or more of 17 different groups that I manage. In Outlook Express I was able to check group membership for each contact under the 'Other' tab. With Vista Windows Mail this membership information does not appear under any of the tabs. This is a serious problem for me as in the event of a query or returned mail I need to know what group they are in. Can it be changed or is this facility available in other versions of Vista?