SYSessential OST to PST Converter is an application for Windows through which users can view and convert inaccessible, orphaned, or corrupted OST files without the need for the Exchange server. This software provides its users with the benefit of previewing everything from emails, folders, and attachments before starting the process of conversion. This utility works on Windows 7, 8, 10, and 11 and retains all the metadata, including emails, attachments, folders, and email headers, as well as additional information such as the sender and receiver.