SysTools Outlook Duplicate Remover is a powerful utility designed to detect and remove duplicate items from Microsoft Outlook. Over time, Outlook data files (PST/OST) can accumulate redundant emails, contacts, calendars, tasks, and journals, making the mailbox bulky and slowing down performance. This tool ensures a clean and optimised mailbox by eliminating duplicates without affecting original data.

The software offers multiple deduplication criteria such as Subject, Sender, Receiver, Text, and Date, giving users complete control over the filtering process. You can remove duplicates within a single Outlook file or across multiple PST/OST files in batch mode. It also provides two options – Within Folder and Across Folder – allowing users to customise how duplicates are detected and deleted.

With support for both ANSI and UNICODE PST files, SysTools Outlook Duplicate Remover is compatible with all major versions of MS Outlook and Windows OS. By reducing mailbox size and eliminating unnecessary duplicates, the tool helps improve Outlook speed, ensures better organisation, and prevents synchronisation errors.

SysTools Outlook Duplicate Remover is built with advanced algorithms to identify and eliminate duplicates from different Outlook items, including:

• Emails: Detect duplicates based on Subject, Sender, Receiver, Date, and more.

• Contacts: Remove repeated entries with the same name, email address, or phone number.

• Calendars, Tasks, Notes, and Journals: Ensure your Outlook data stays clean and clutter-free.

The tool offers two modes for removing duplicates:

1. Within Folder Mode – Removes duplicate items stored inside the same folder.

2. Across Folder Mode – Detects duplicates spread across different Outlook folders.

Advanced Filtering Options

One of the standout features of this tool is its customizable filtering. Users can set criteria such as Subject, Body, Attachments, and Sender details to accurately detect duplicates. This flexibility ensures that only unwanted items are removed, while unique data is preserved.