If anyone needs to combine PST files in MS-Outlook without any duplicates then I would be recommended the KDETools PST Merge. It Combines PST files such as Emails, Contacts, Calendars, Contacts, Notes and all. It Combines PST files in ANSI and also UNICODE formats. Merge PST files in all Version of Windows and Outlook. Combine Password - Protected PST files in MS-Outlook. Merge PST files without any data loss.
Step 1. Start the tool and add PST files or folder.
Step 2. Select the Merge option and click Next.
Step 3. Select Merge All Folders or Selected Folders as per the needs.
Step 4. Choose Merge in New PST, Existing PST or Outlook Profile.
Step 5. Check the “Skip Duplicate Items” to remove duplicates from Mail, Contacts, Calendars, etc.
Step 6. In the end, click Next.