The Forgotten File Format—How MST Becomes PST and What It Hides

Thu, 16 Apr 2026 22:41:30 +0000

The Forgotten File Format: How MST Becomes PST and What It Hides In the complex world of Microsoft Outlook, few file formats carry the mystique—and risk—of .MST. Often overlooked and easily misunderstood, the MST file format is Microsoft Outlook’s proprietary backup format, a hidden safeguard that preserves user data but also conceals secrets worth knowing. If you’ve ever wondered what’s buried in these .MST files, or why they matter in data recovery and privacy, this article uncovers the dormant life of the forgotten format—and what it’s quietly hiding. --- ### What Is an MST File?