You can recover data from an Outlook OST file by following these steps:
Create a backup of the OST file: Before attempting to recover any data from the OST file, it's important to create a backup copy of the file to ensure that no data is lost in the process.
Use the built-in repair tool: Outlook includes a built-in repair tool called ScanOST.exe or ScanPST.exe (depending on the version of Outlook) that can be used to repair minor issues in the OST file and recover data. To use the tool, close Outlook, find the ScanOST.exe or ScanPST.exe file on your computer, and run it. Then, select the OST file to repair, and click "Start."
Convert the OST file to a PST file: If the built-in repair tool is unable to recover the data, you can try converting the OST file to a PST file. To do this, open Outlook and go to File > Open & Export > Import/Export. Select "Export to a file," and then choose "Outlook Data File (.pst)" as the export type. Select the OST file to convert, and follow the prompts to complete the conversion process.
Use third-party recovery software: If the built-in repair tool and conversion process fail to recover the data, you can try using third-party recovery software specifically designed for OST files. There are several such software tools available for purchase online. Make sure to choose a reputable tool and follow the instructions carefully.
In general, it's best to try the built-in repair tool first, as it's the easiest and most straightforward solution. If that fails, you can try the conversion process or third-party software. Remember to always create a backup of the OST file before attempting any data recovery process.
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