MS Outlook OST Recovery - Version 3.1 MS Outlook OST Recovery and OST to PST Conversion Tool is the best solution to recover MS OST files, after not working of Exchange server or OST corruption you can use OST to PST conversion tool is the best option But you can convert OST to PST manually you might be need a third party tool to convert OST to PST. That will help you to convert Outlook OST files into PST files with the help of this process you can easily repair your OST files. This software supported in Microsoft Exchange server 5.0, 5.5, 2003, 2007 and 2010 to Microsoft Outlook 2010, 2007, 2003, 2000 and 97. After you download the software in FREE demo version, you can online purchase of SysTools OST Recovery and OST to PST Conversion software only just at $99 for the personal license and only just at $199 for the business license and only just at $399 for the enterprise license for you.