The solution lies buried deep within

Data file corruption can prevent Outlook from opening your email data (email messages, contacts, calendars, and so on). If your PC won't start Outlook or Outlook won't load your mailbox, you might be able to fix the problem by repairing an Outlook data file.

In this tutorial, you will learn how to repair corrupted Personal Storage Table (PST) and Offline Storage Table (OST) files in Outlook.

In most cases, running a corrupted data file through the Inbox Repair tool should be enough to fix it. But sometimes you need to take additional steps to recover lost items.