“How do I read the OLM file in Windows 8.1? I posted this query on a technical forum and got suggestions for this 4n6 Mac OLM Viewer wizard. As it is a free tool, I downloaded it on my system immediately. I was amazed by the working speed and accuracy of this tool as it scanned 7 GB of data in just a few seconds. It also has a dedicated preview panel to view OLM file data with all attributes."