From Gladwev Software:
OLM Converter Pro is an easy to use but powerful utility to convert your Microsoft Outlook for Mac 2016 and 2011 exported OLM File (.olm) contents to common standard formats for Mac Mail(Apple Mail Archive), MBOX (.mbox), vCard (.vcf), iCalendar (.ics), RGE(Microsoft Entourage Archive) or EML (.eml)] so that it can be migrated to Apple Mail, Microsoft Entourage 2004/2008, Mozilla Thunderbird, Postbox or any other software application which supports import from these formats on variety of platforms.
What's new in this version:
1) OSX Sierra update.
2) Improved OLM to MIME generation.