Mac and Windows are two of the most popular computer OS used by many organizations and persons and many of them use Outlook as their main email client in either of these two operating systems. OLM file is Outlook data file Mac OS and can't be accessed in Windows version Outlook. That's why users want to switch from Mac to Windows PC having a problem while trying to move their import Outlook mailboxes and other data from Mac to Windows.
Here the best option to perform easy migration of Outlook database from Mac to Windows is to convert OLM file into PST file which is an Outlook data file Windows and easily accessible in any version of MS Outlook for Windows.
You can complete the conversion of OLM to PST in just a few steps using a third-party OLM to PST Converter software. In this method first, you need to export your Outlook mailboxes and other data as an OLM file and then use the OLM file Converter software to convert it to PST file format with all mailboxes, contacts, calendar, tasks, notes, journals, etc. Refer to this blog for a more detailed process- https://www.firevista.com/outlook-from-mac-to-windows-olm-to-pst/