Use the most famous tool is eSoftTools OST to PST converter software. You can fix the error OST file with simple steps in some time. It has supported all versions of Windows operating systems like Windows7, windows 8, Windows 8.1, and Windows 10 . Technical and non-technical users can easily operate these tools. There are many features in this tool such as Multiple file conversion, naming conversion, split PST file, and recovering corrupted OST files. Try a free demo version from the website of eSoftTools.