OLM Exporter has the ability to convert and export your Outlook for Mac data file (.olm) contents quickly. It allows you to convert your Contacts, Calendar/Tasks, and Mails from OLM files to .vcf, .ics, and .mbox files. In addition, it lets you export Contacts, Calendar events, and Tasks from OLM to Apple Contacts (Address Book), Apple Calendar (iCal), and to Apple Reminders.
It exports contact data from the Apple’s Contacts app into various formats.
Migrate emails from Outlook for Mac to other email clients.
It helps you convert and move items from Outlook Mac to MS Outlook for Windows.
It opens Microsoft Entourage RGE Archives and exports the contacts as CSV.
Import OLM to Apple Mail, Thunderbird, Entourage, host of other emails clients.