Mac creates an OLM file, whereas Windows Outlook creates a PST file. We will also learn about different techniques to migrate from Mac Outlook to Windows Outlook with the help of the SysTools OLM Converter.Although Mac and Windows Outlook are very much similar in terms of functionality, the two differ in their data storage formats. The user will get a clear idea about OLM and PST file types, their needs, and their differences. Summary: This article is about how to export Mac Outlook 2016 to PST file format.