This document discusses using open source and freeware tools to process PST files. It introduces two tools that can be used: Autopsy, a digital forensics platform, and MantaRay, a set of Python modules that automate various open source forensic tools including PST processing. MantaRay allows examiners to select multiple tools, set options, and have the tools run automatically. The document provides an example command to use the readpst tool to extract emails from a PST file. It also discusses potential workflow tweaks like integrating MantaRay's PST processing with Autopsy keyword searches.