You can use Split Outlook PST Tool to split the large size of PST files into small parts of PST files. Its quickly works to Split large size PST files in small PST formats without any data loss. Its application easily splits the large PST files into small files by Size, Date, Year, & Folder. The tool is compatible with both ANSI and UNICODE PST files. free Version is also available.
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Split large PST file into multiple small PST files