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To convert OST files to PST format using Windows PowerShell, follow these steps for an effective solution. First, run PowerShell as an administrator and set the execution policy to allow scripts by entering the command Set-ExecutionPolicy -ExecutionPolicy Unrestricted. Next, navigate to the location of your OST file using the cd command, then use a PowerShell script to export the OST file to a CSV format. After that, create a new PST file in Outlook and import the CSV data into it. This method is suitable for basic conversions but may not handle large or corrupted files effectively. For a more robust solution, consider using dedicated software like WebbyAcad OST to PST Converter. This tool simplifies the conversion process, allowing users to recover corrupted OST files and convert them to PST without losing data integrity. It supports various formats and maintains folder structure during conversion. Users can download a free trial version to test its capabilities before purchasing.