The Kernel Outlook PST Viewer is a lightweight and user-friendly tool designed to open and view PST files without needing Microsoft Outlook. It allows users to access emails, attachments, contacts, calendars, and other mailbox data stored in PST files. The PST viewer tool supports both ANSI and Unicode PST formats, provides a search feature for quick navigation, and enables users to preview mailbox items in a readable format. It is a convenient solution for viewing PST file contents without requiring a full Outlook installation.