You can try OLM to PST Convert a third party tool.
I also use this software .
This softwae Features
Provides user with the safe and reliable platform to convert all user mailbox data stored in OLM file
Restores damaged or corrupted OLM file instantly and extracts data from it
Make use of advanced functionality to display the preview of user data after extracting them from OLM file
Facilitates user with exceptional option to stop the running process of generating items from recovered folder if required
Provides user with an option to save the recovered folder items as HTML file
Competent enough to perform the successful conversion of Outlook for Mac emails to MS Outlook
For more information and free download here :
http://www.olmtopst.n.nu