Get the Quickest way to convert MBOX to OLM. Download and install Advik MBOX to OLM Converter to open MBOX file in Outlook for Mac.
Download Link - https://www.adviksoft.com/mbox/olm.html
Steps to convert MBOX to OLM are;
Step 1. Run Advik MBOX to OLM Converter in your system.
Step 2. Add MBOX file in the software.
Step 3. Select Mailbox folder that you want to convert.
Step 4. From Multiple Saving options, Select "OLM".
Step 5. Click on the convert button
Done this is how you can easily convert MBOX to OLM file eaily.