To split large PST files into small pieces with a safe process than trying to use KDETools PST Splitter Software. It Split various PST files in MS-Outlook. It breaks oversized PST items based on date, size, year, and folder without any damaging the original data. Capable in all Version of Windows and Outlook. It split PST files without MS-Outlook installation. It breaks PST files in ANSI and also UNICODE formats. It has a free version also available.
More Info: https://www.kdetools.com/pst-splitter/