If you want to merge several PST files into one without duplicates, it’s better to use a professional tool instead of doing it manually. The manual Import/Export method in Outlook can work, but it’s time-consuming and doesn’t remove duplicates properly.
I recommend using the
Advik PST Merge Tool, which makes the process fast and simple. It lets you combine unlimited PST files into a single file while keeping all your emails, contacts, calendars, and attachments safe. The tool also maintains the original folder structure (Inbox, Sent, Drafts, etc.) and gives you the option to remove duplicate items before merging.
It supports all versions of Outlook and Windows OS, so compatibility isn’t an issue. You just need to add your PST files, choose whether to join or merge them, enable the “Remove Duplicates” option, and start the process. It’s much faster and safer than spending hours doing it manually. You can even try the free demo version of Advik PST Merge Tool to see how well it works with your data before purchasing.