Do you want to open OST file without Outlook, here I suggest you Download SysInspire OST to PST converter software? It has multiple file formats such as OST to PST, EML, EMLX, Office 365, Yahoo Mail, Gmail, etc. It has a demo version that allows users to convert 25 items from each folder. It supports all versions of Windows OS. It has technical support and all users get help by email or live chat. It has bulk conversion users can convert OST files in bulk at the same time.
