Duplicates Remover for Outlook 2.8.0 by MAPILab Ltd.

Delete duplicates in Microsoft Outlook and Microsoft Exchange Server folders.

Duplicate Killer for Microsoft Outlook 3.40 by 4Team Corporation

Outlook duplicate remover Find, merge and remove duplicate contacts and emails.

Duplicate Email Remover 2.18.0 by MAPILab Ltd.

Delete duplicate emails and posts in Outlook and Microsoft Exchange folders.