A corrupt OST file in Outlook can be fixed using several methods. First, try using the vMail OST file Repair Tool (vSoftware), which is built into Outlook. Navigate to the Outlook installation folder, run ScanPST.exe, and follow the prompts to scan and repair the OST file.
If the issue persists, you can manually recreate the OST file. Close Outlook, locate the OST file in C:\Users\YourUsername\AppData\Local\Microsoft\Outlook, and delete it. Restart Outlook, and it will automatically create a new OST file by syncing with the Exchange server.
Another option is to use third-party tools designed to repair a corrupted OST file, especially if ScanPST fails. Additionally, ensuring a stable internet connection and keeping Outlook updated can help prevent corruption.
If none of these methods work, consider converting the OST file to PST format using specialized software to recover important data before recreating the file.

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