SYSessential OST to PST conversion software is quite user-friendly and comes in a Windows application that enables you to access corrupt and orphaned OST files without the need for any Exchange Server or Outlook. The utility software supports conversion of OST files into PST and numerous other file formats. You are able to convert many files at once while having a preview of your data prior to conversion. This software specializes in converting OST files that do not have an Exchange Server connection. Supports all versions of Windows (7-11).