OLM to PST Conversion

Is there anything that will convert a olm file to pst?  

I've tried the software that claims to do so but doesn't open the files I currently have in the .olm format.  

I created lists in my contacts...they are exported files from outlook on my Mac and are exported as an .olm file.  

I can't open this file.

When I tried to use the trial downloads of two different olm to pst conversion software, it wouldn't work.

Any ideas to help?? Thank you!