"OST" stands for ‘Offline Storage Table’ files of Microsoft Outlook. These files are created from Microsoft Exchange when working off-line.However, the OST file allows you to also work with your emails, contacts and calendars when you are not connected to the Exchange Server. Thus is stores your online data offline. This is really great because you can still work in Outlook even when the server faces down time.In addition, you can check by using SCANOST.EXE which is very similar to SCANPST.EXE. This inbuilt utility is used to scan corrupt OST files and determine the errors in OST files. In case, the particular OST file is found corrupted, Scanost.exe automatically resets the file structure and rebuilds the headers and make them reusable.

Unfortunately, SCANOST.EXE is not much powerful to offer you the best result as you need. In such situation, you need third-party OST to PST Converter software that can repair and recovers corrupt, damaged, infected, lost, or deleted OST file with all email properties also such as To, From, Subject, CC, BCC, and Date.Also provide various options to save repaired OST file like PST/PDF/HTML/MSG/RTF/TXT/EML file format.

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