Find Duplicates BEFORE You Save! Instead of waiting until after you enter a new record's information to know if it's a duplicate, know after the first field if you're working on a duplicate. Say NO to redundant data! Improve your SugarCRM data quality by being prompted of duplicate values while creating new records.
#2635 - Check for Duplicates
I think that I misunderstood what this could do when I purchased. I was under the impression that it would go through current records and identify duplicates. I can't seem to find that functionality.
Other add-ons of interest
Glances - Integrate All Your Applications
Accomplish More Every Day. Spend your time on getting things done, not on finding information. Glances securely connects all of your apps and provides a simplified view of the data you need right when you need it, in real time.
Find the duplicate records by names, anyphones, and email-address from the modules like Account, Contacts, Leads. This addon helps you to quickly find and merge the duplicate records in CRM