How do I consolidate PST files in Outlook 2025 while avoiding duplicate messages?
If you're struggling with duplicate items in Outlook, GoldyTools Outlook PST Duplicate Remover offers an efficient and reliable solution. This powerful tool can scan and remove duplicate emails, contacts, calendars, notes, journals, tasks, and more from multiple PST files in a single attempt.
Users have the flexibility to select specific items for duplicate removal, especially when the location of duplicates is known. The tool supports bulk PST file processing with no file size limitations, making it ideal for both personal and enterprise use.
GoldyTools PST Duplicate Remover is fully compatible with all major versions of Microsoft Outlook (2021, 2019, 2016, 2013, 2010, 2007, 2003) and runs seamlessly on all Windows operating systems.
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https://www.goldytools.com/outlook-pst-repair.html

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ashish singh commented
To consolidate multiple PST files in Outlook 2025 while avoiding duplicate messages, the most reliable solution is the Shoviv PST Merge Tool. This professional software is designed to seamlessly merge several Outlook PST files into a single, manageable file without data loss. One of its standout features is the ability to eliminate duplicate items during the merging process, ensuring your consolidated mailbox remains clean and well-organized. The tool offers flexible options like Join PSTs, Merge PSTs, and Merge Contacts, giving users full control over how data is combined. It preserves the original folder hierarchy, email properties, and metadata while handling both ANSI and Unicode PST files of any size. With its user-friendly interface and efficient processing, Shoviv PST Merge Tool saves time, prevents Outlook performance issues, and provides a smooth way to manage scattered PST data. For Outlook users seeking to merge PST files without duplicates, this tool is the best choice.
PST Merge Tool: https://www.shoviv.com/pst-merge.html
Merge PSt Files: https://www.shoviv.com/blog/how-to-merge-pst-files-manually/