If your PST file won't repair and Outlook continues to crash, consider these steps. First, ensure that you've used the built-in Inbox Repair Tool (ScanPST.exe) correctly, as it may not fix severe corruption. If ScanPST indicates success but issues persist, the file might be too damaged or oversized. In such cases, using a third-party tool like Shoviv Outlook PST Repair Tool can be beneficial. This tool is designed to handle complex repairs and recover data effectively. Always back up your PST file before attempting repairs to prevent data loss during the process.