If you are looking for easy techniques to break large PST files, I would recommend using Aryson PST Splitter. The tool helps users split large PST files with 100% accuracy. The tool splits PST files based on file size, date, sender, and folders. The tool can convert multiple PST files, including emails, calendars, contacts, journals, notes, and tasks. Users can set passwords on new PST files. It offers a demo version of the software which splits only 50 emails per folder for free.
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https://www.arysontechnologies.com/split-pst-file.html