The free method to convert OST to PST without Outlook is using demo version of EmailsGuru OST to PST Converter. It allow users to convert OST file to PST format without Outlook profle or Exchnage Server. This tool preserves all your emails, attachments, original file formatting and folder structure. It is developed in such a way that any technical and non-technical users can effortlessly convert OST file to PST without any data loss. It is fully compatible with Windows 11, 10, 8.1, 8, 7, XP, Vista, etc. Any new users can use free demo version and take advantage of this well developed tool to convert 25 items from an OST file to PST.