Hi Theresa
Yes, indeed there is ! Login as Admin (or a user with relevant permissions) and go to Tools | Manage | Check for Duplicates - you then just add in the fields you want to use for DupeChecking and what you want to check (a group, entire DB etc) and it will then find them.
Unfortunately, this is all it does - it doesn't give you a list, you have to pretty much deal with them as it finds them. There are various tools out there (like Paribus, DQGlobal etc.) that does have these features. But, at least you have something to start with!
Regards
Mike