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If you want to split a large PST file without using Outlook, you can use the Softaken Split Outlook PST Software, which can split a large PST file into a small PST file. The application easily splits any size PST file without installing MS Outlook. It allows users to divide PST files using advanced options such as size, year, or folder selection. It safely maintains email messages, attachments, and folder hierarchy throughout the process. It supports all the Windows versions: 11, 10, 8.1, 8, 7, etc.