The Advik PST Merge Tool combines your small PST files into a single file. It allows you to merge Outlook Contacts, Emails, Calendars, Journals, and other mail items. The tool also has an option to remove duplicate items from the selected PST files. You can merge multiple Outlook data files containing emails, contacts, calendars, tasks, and more. It provides three advanced options for merging multiple PST files into one PST. Additionally, it allows you to remove duplicate items from the selected PST files.