The most efficient method to split a large PST file in Outlook into smaller chunks is through the Regain PST Splitter Tool. The tool offers three effective splitting options: by file size, date range, or by sorting emails by sender, recipient, or subject. It preserves all significant email details, such as attachments, timestamps, and headers, and keeps your original PST file secure. Supporting both UNICODE and ANSI modes, and Windows and MS Outlook versions, Regain PST Splitter is an easy-to-use utility with stable performance that can serve as the best tool for handling large-sized PST files efficiently.

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