How can I get access to the "Deduplicate" tool?
The Deduplicate feature is available in the Enterprise and Professional Editions and accessible only to the users with CEO Role. Please contact the administrator of your account for access to the feature.
To access this feature, go the [Module] Home page and under [Module] Tools, click Deduplicate [Module].
(Module refers to tabs like Leads, Contacts, etc.)

See Also Deduplicate Records