You can keep your Outlook PST files organized by removing unwanted duplicate items. Then use a perfect tool like SameTools PST Duplicate Remover. This tool automatically finds duplicate PST files like emails, contacts, tasks, notes, etc, and removes them without losing data. This tool manages a large duplicate PST files without the help of any other software. It will support all Windows OS versions like 11, 10, 8.1, 8, and 7. Non-technical users can also try the software before purchasing this tool. It has a simple UI to operate this tool.
Visit here: https://www.sametools.com/duplicate/pst/