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You can use eSoftTools Converter or OST to PST converter software to open an offline OST file directly without Exchange. All you need to do is download eSoftTools OST to PST Converter and then launch the software on your Windows PC. Then browse to select the OST file and click 'Next' to access and open the OST mailboxes and mail items.

Now, check the components of the file whether it is correct or not then go for the conversion and it is ensured that you will get fruitful results.

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open OST file