OST files are the files created automatically in the system, when the server fells down it can be used in offline mode but while working in online mode and connectivity fails due to several reasons then this file gets corrupted, so to recover this damaged OST files a third party tool is required which can convert corrupted OST data into accessible PST, it support all the version of MS Outlook 97, 98, 2000, 2002, 2003, up to 2016 and able to export your data into Office 365 and live Exchange server directly.
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