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OST files are the exact replica of Exchange mailbox Server. It provides a facility to the users to work in a offline mode in the absence of Internet. And it gets synced with the Exchange server once Internet connection is established. However, OST files are vulnerable to corruption.Reasons of OST file corruption There are many reasons of OST file corruption such as Oversized PST file, abrupt shutdown, virus and malware attack, etc.

Use ScanOST.exe to repair OST file: To repair corrupt OST file, you can opt for ScanOST.exe utility. It will help you to repair corrupt OST file. However, the only drawback with this tool is, it only helpful if the corruption is minor. https://support.microsoft.com/en-us/help/983036/the-scanost-exe-tool-is-not-available-starting-with-outlook-2010

Use Professional help If manual method doesn't work, you can choose OST to PST Recovery tool to get rid of such issue in just a matter of minutes. Visit: **http://www.osttopst.us**