How do I fix a corrupted OST file?
Can’t open the Outlook OST file and worried about losing your emails? The DataRecoveryFreeware Exchange OST File Recovery gives you a safe way to access and recover mailbox data from corrupt or damaged OST files. It can fix 0x80040115 Outlook error and recover all types of mailbox items, including notes, tasks, and journals. You have options to save data in formats like PST, EML, MSG, MHTML, and PDF. A friendly preview pane helps you verify the recoverable items before saving. Rather than this, it works seamlessly with orphaned and encrypted OST files without needing Outlook installed.
For more: https://www.datarecoveryfreeware.org/blog/0x80040115-outlook-error/