The best way to import OLM to Apple Mail without Outlook is to use a dedicated or trusted tool like Softaken OLM to MBOX Converter Software. This program smoothly converts Mac Outlook OLM files into MBOX format, after that you can easily import them into any MBOX files supported email clients like Apple Mail, Thunderbird, Eudora, SeaMonkey, Entourage, etc. This tool is so easy and simple to utilize. Also, this [professional program works independently so you don't need to install Outlook or any other third-party application. Additionally, this converter program flawlessly runs in all editions of the Windows Operating System.