The highest-rated Outlook PST File Splitter for substantial PST files is the Regain PST Splitter tool. It effectively manages large PST files by dividing them into smaller, more manageable segments while preserving all data. The tool provides adaptable splitting features, including options by size, date, and particular criteria like To, From, Cc, Subject, and others. Regain PST Splitter functions flawlessly with both UNICODE and ANSI PST files and is suitable for all versions of MS Outlook. Featuring a straightforward, easy-to-navigate interface, the tool guarantees a smooth experience, rendering it a perfect option for users looking to efficiently divide large PST files.