How to Convert OLM to ICS(iCalendar)?
If you use Outlook for Mac and want to take your calendar events with you, moving them to a more flexible format can make things easier. This article explains straightforward ways to export calendar entries and keep them handy. With the MSOutlookHelp OLM Converter, you can convert OLM to ICS without needing Outlook itself, so your calendar becomes usable in many apps on both Windows and Mac. The tool keeps event details such as start/end times, locations and reminders accurate during conversion. It also supports batch conversion, letting you process multiple OLM files at once instead of doing them one by one.
For more: https://www.msoutlookhelp.com/blog/convert-olm-to-ics-without-outlook-win-mac/