If your Outlook mailbox is filled with duplicate emails, contacts, or calendar entries, it’s likely due to syncing errors, import/export activities, or corrupted PST files. Manually cleaning them can be frustrating and time-consuming. A better option is to use a professional utility like SysTools Outlook Duplicate Remover.

This tool automatically scans your Outlook PST, OST, or BAK files and removes duplicates based on parameters like sender, subject, date, and attachments. You can choose to remove duplicates within folders or across multiple folders, giving you full control. It also provides options to delete, move, or flag duplicates instead of permanently removing them, ensuring complete data safety.

SysTools Outlook Duplicate Remover supports all Outlook versions (2021, 2019, 2016, 2013, etc.) and works even if Outlook isn’t installed on your system. It maintains your folder hierarchy, generates detailed reports, and handles large files efficiently. Overall, it’s one of the most reliable and effective tools to clean up Outlook and improve performance.