Converting OST files to PST without Outlook is possible with professional OST to PST converter software. Since Outlook does not provide a direct option to export an offline OST file without an active account, specialized software can scan and extract mailbox data independently. Add the OST file, preview emails and other folders, select PST as the saving format, and start the conversion. The tool can preserve emails, contacts, calendars, tasks, attachments, and folder structure while converting OST data to an accessible PST file. https://logcla.com/blogs/1844053/How-to-Convert-OST-Files-to-PST-without-Outlook