How to Remove Duplicate From Outlook?

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Over the years, your Outlook mailbox gathers duplicates—emails forwarded multiple times, contacts saved repeatedly, old tasks copied into new folders, and calendars synced from different devices. Eventually, Outlook becomes slow and your PST file grows larger than you expected. To clean things up, you decide to use the SysInfo Outlook Duplicate Remover.

You load one or more PST files into the tool, and it instantly shows you a full preview of all folders and subfolders. You choose whether the tool should search within specific folders or scan everything. You can also apply filters, like checking for duplicates only within a certain date range or only for emails or contacts. Once duplicates are found, you decide how they should be handled—delete them, move them to a separate folder, or simply mark them.

After running the process, the software creates a fresh PST file with all your mailbox data except the duplicates. The once cluttered mailbox becomes organized, smaller in size, and easier for Outlook to handle. It feels like giving your email account a long overdue cleaning without losing anything important.

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To remove duplicates from Outlook, you can try sorting emails by Subject, From, or Date and manually deleting repeated items, or use Outlook’s Clean Up tool to remove redundant messages—but these methods often miss duplicates caused by syncing or importing data. For a fast and accurate solution, the SysTools Outlook Duplicate Remover Tool automatically scans your PST/OST files, detects duplicate emails, contacts, calendars, tasks, and more, and removes them safely without affecting original data. It’s the easiest way to clean and organize your Outlook mailbox.