This document discusses MS Outlook corruption, its causes, and solutions. It introduces MS Outlook and describes extensible features. Common causes of corruption include accidental data deletion, viruses, improper system configuration, and oversized mailboxes. Hardware issues like improper shutdowns, power failures, or network errors can also cause corruption. The document recommends using the Scanpst.exe tool located in the MS Office folder to repair corrupted PST files and prevent corruption by maintaining backups, avoiding oversized mailboxes, splitting large PSTs, using PSTs locally, and keeping free disk space.