There are lots of reason that Outlook OST file got corrupted due to various ways such as Power failure, virus attacks, abnormal shutdown. In order to make the recovery fast and secure, there is third party OST to PST Converter which free(demo) is also available in DataRecovo Software.
Get more manual ways to fix Errors in OST file: https://www.datarecovo.com/blog/how-to-fix-errors-have-been-detected-in-the-ost/
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