Search for groups/distribution lists?

[Rich Graves]

We have some migrated users with large address books (> 1000 entries). In GroupWise, they typically used their personal distribution lists by picking them from the addressbook, not autocomplete. So they may not actually remember the name of their list.

Is there a way to search for Contacts that are groups, versus individual contacts? Preferably in ZWC, but Outlook 2007 would work, too.