How to Analyze Outlook PST Files for Forensic Investigations?

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In digital forensics, Outlook PST files are often critical evidence sources. A PST (Personal Storage Table) file contains emails, attachments, contacts, calendars, tasks, and deleted items. Proper analysis can help investigators trace communication history, verify timelines, and recover potentially important data.

Key Steps in PST File Analysis

1. Preserve the Original File
   Always create a forensic copy of the PST file before analysis. Avoid modifying the original to maintain data integrity and the chain of custody.

2. Verify File Authenticity
   Check file metadata such as creation date, modification date, and hash values (MD5/SHA) to ensure the file has not been altered.

3. Examine Email Headers
   Email headers provide valuable information such as sender IP addresses, routing paths, timestamps, and authentication details.

4. Recover Deleted Items
   PST files may contain recoverable deleted emails. Forensic tools can help identify and extract such data.

5. Analyze Attachments
   Attachments may contain hidden evidence. Reviewing embedded files, metadata, and file properties is essential.

6. Export Evidence Properly
   Export selected emails or data in formats such as PDF, EML, or CSV for documentation and reporting purposes.

Recommended Tool for PST Analysis

For efficient viewing and forensic examination, the Cigati PST Viewer is a reliable third-party utility. It allows users to open and inspect PST files without requiring Microsoft Outlook. The tool supports a detailed preview of emails, attachments, contacts, calendars, and other mailbox items, making it useful for investigators, IT professionals, and legal teams.