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If you are searching How to open OST file without Outlook? I suggested it to you. Using the eSoftTools OST to PST converter software and install your computer. It provides many functions such as  recovery OST file option, email filtration, split PST file option, OST to PST converter option, naming convention, and other functions. And select OST to PST converter option, you can convert OST file to PST and many more formats. After conversion, you can easily open OST file without Outlook. You can check the free demo version provided by tools.

Read more:- Open OST file without Outlook