The Data Management section can be found by going to Settings | System. As you can see in the following screenshot, it is here that you configure Duplicate Detection Rules and Duplicate Detection Jobs, carry out a bulk record deletion, manage the mapping of imported data, and manage import jobs. You can also load or remove sample data for development environments from here.

The Duplicate Detection Settings section allows you to enable or disable duplicate detection and provides options for some of the most common scenarios when duplicate detection should run. You can check for duplicates on a record being created and updated or on Outlook going offline, coming back online, and during data import.

In the Duplicate Detection Rules section, you have the ability to enable some of the out-of-the-box rules provided or to create new rules and update the existing ones. For a rule to be active, it must be published. When you are editing rules, you must unpublish the rule first, make...