The SYSessential OST to PST converter is one of the several applications that provide different functions that help people and experts in changing the mailbox data in different forms, depending on the business requirements; hence, they can migrate the orphaned OST data to PST data without compromising any data from the mailbox. The application helps people in changing their OST data into different forms such as PST, EML, EMLX, MSG, NSF, and PDF. This application has the ability to change the mailbox data in the same form as the original mailbox, which clearly indicates its knowledge about the migration process in businesses. It also provides users with the ability to recover damaged or unreadable mailbox data, enabling them to use the Outlook mailbox without any technical difficulties. This application supports all Windows operating systems, for example, XP, Vista, 7, 8, 10, and 11, without requiring the installation of Outlook in the system.