Do you know you cannot import OLM files to any other platform without converting them? Yes, you read it right, just because the OLM files are used by Microsoft Outlook for Mac. If you want to share with a Windows user, then you need to convert the OLM files.
But now the question arises: how to convert so many OLM files? Is there any method to convert OLM files? The answer is yes; you can convert the OLM files into MBOX by using the two different methods. (1) Manual Method (2) Professional method
Note: If you are using the professional method, you cannot convert multiple OLM files at the same time, but the chances of your data being secure also increase. So, I recommend that you choose the professional method to convert OLM files.
Professional method to convert the OLM files
Step- 1) Download Professional software and run this tool as a administrator.
Step- 2) Now, select the OLM files from the software.
Step- 3) Then, select the email from software.
Step- 4) After, that select the file format from the drop down list.
Step- 5) Choose the path to save the resultant file.
Step- 6) Last, start the conversion by click on the convert button.
To know more:- https://www.datarecoveryfreeware.org/olm-converter-tool/