The Inbox Repair Tool, also known as Scanpst.exe, is a free, built-in utility provided by Microsoft to diagnose and repair errors within Outlook Data Files (.pst and .ost). When Outlook crashes, freezes, or refuses to open a set of folders due to file corruption, this tool scans the file structure to rebuild and correct damaged components. Where to Find It
The tool is automatically installed alongside Microsoft Office but is hidden within your local file directories. Its location depends on your version of Outlook and Windows architecture:
Repair Outlook Data Files (.pst and .ost) – Microsoft Support
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