The best tool built explicitly for legacy Outlook Express is MAPILab’s Remove Duplicates from Outlook Express. Because Outlook Express uses different file architectures (.dbx files) than modern Microsoft Outlook (.pst and .ost files), modern deduplicating software will not work directly on it. However, if you have migrated or plan to migrate your old data into Microsoft Outlook, a wide variety of robust, modern automated tools become available. Specialized Outlook Express Tool
MAPILab Remove Duplicates from Outlook Express: This is one of the only dedicated legacy utilities designed specifically for Outlook Express folders.
It scans localized Outlook Express folders to safely clear identical messages without data loss.
Users on platforms like Super User have successfully automated it using scripts within legacy environments (like Windows XP virtual machines) to process massive, multi-thousand message archives. Top Alternative Tools (If Migrated to MS Outlook)
If you import your Outlook Express data into a newer version of Microsoft Outlook, you can choose from these highly-rated third-party tools to handle your .pst or .ost data files: Handling Duplicate Outlook Express Messages – Super User
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