If you are looking for the best tool to open OLM files, I would like to recommend the MacSonik OLM Viewer Pro tool. This is a professional utility that can scan and view unlimited Mac OLM files. It also converts and saves OLM files into multiple file formats on macOS. This tool has a simple and user-friendly interface, which allows users to view and read Mac OLM files without using Outlook. If you want to open your OLM files on your system without Outlook, then this tool is a perfect fit for you. Using this solution, you can easily find your OLM files on your local system and view them using this utility.
Also Read: https://www.macsonik.com/olm-viewer/