How to create MBOX file in OLM file? Download and use the latest MBOX to OLM Converter which allows you to convert multiple MBOX emails to OLM file by keeping all email properties i.e. attachments, hyperlinks, images, mail header, etc. into OLM file with 100% accuracy. The software supports bulk email conversion process, so you can export all MBOX email files into OLM at a single time processing. Try the free demo version and understand how to create MBOX file in OLM file for free of cost.