The simplest way to convert OST to PST is to use the Aryson OST to PST Converter software. This software can convert multiple OST files to PST format including attachments. During the conversion process, the software maintains all folder structures and prevents changes or data loss. It also lets you import OST file data into Yahoo, Hotmail, Thunderbird, Office 365, Exchange Server, IMAP servers, AOL, OperaMail, Amazon WorkMail, GoDaddy Webmail, HostGator Webmail, Yandex, and more. Moreover, this tool is compatible with the Mac, Windows, and Linux operating systems.