IDLookup is absolutely indispensable for integrating data from external sources into Raiser’s Edge and it is easy enough to configure and run that several users on our Donor Relations staff use it regularly, not just the DBA. I regularly export recently added constituents and then use IDLookup to identify duplicate constituents that need to be merged, or multiple records with the same email address so we don’t email them repeatedly by accident. I have also used it to identify unlinked relationships that match existing constituents which helps us avoid sending duplicate mail to households.