SysTools Outlook Duplicate Remover is a powerful tool to remove duplicate emails, contacts, calendars, tasks, notes, and journals from Outlook PST/OST files. It offers two modes – remove duplicates within a folder or across folders – ensuring a clean and optimised mailbox. With advanced filters, you can remove duplicates by subject, sender, date, or attachments. The tool supports all Outlook versions and helps reduce PST size, improve performance, and keep data organised.