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Outlook Duplicate Remover is a premier, risk free tool designed to delete duplicate mailbox items emails, contacts, calendars, tasks, and journals from Outlook PST files. It detects and removes duplicates from multiple PST files, creating new PST files without duplicates. Key features include the ability to preview mailbox files, folders, and subfolders, and to find duplicates across various subcategories. The tool has no file-size restrictions and offers options to manage attachments, including saving them to specific folders. It operates without requiring MS Outlook installation and supports all Outlook and Windows versions, including Outlook 365, 2019, 2016, 2013, and 2010, as well as Windows 11, 10, 8.1, 8, 7, Vista, and XP. Additional features include importing and previewing single or multiple PST files, and detecting and removing identical PST items by comparing subjects, sender addresses, text, attachments, and more. It also allows users to remove or save attachments into specific folders, remove duplicates based on a selected date range, search for duplicates within folders or across PST files, and manage duplicates with options to move, delete, mark, or flag items. Users can choose or create a destination folder for saving new PST files and managing identified duplicates. The tool features a user-friendly GUI, making it accessible to all users. It requires a Pentium class processor, 512MB RAM (1GB recommended), and enough disk space to store recovered output. Version 21.1, released on February 14, 2022, is available under multiple user licenses and supports a broad range of Outlook and Windows versions.