Your PST file is too large, and if you want to open it in Microsoft Outlook, I suggest the best solution is to use the Softaken Split Outlook PST Software to split the PST files into multiple smaller, more manageable files. It safely splits large PST files without affecting emails, attachments, contacts, or other mailbox data. The tool allows you to split PST files by size, date, year, or folder, making it. It supports all versions of Outlook and Windows operating systems, ensuring smooth performance. By splitting the large PST file, you can resolve opening issues and improve Outlook performance without risking data loss. You can check the free trial version on their sites and explore the software.