hii,
If you want to convert OLM file to PST format then you can use this software OLM to PST Converter . it's easy to use and one click download. you can also try the demo version of this software ,By following simple steps you can easily convert your OLM files into PST files for windows such as emails ,sent items , outbox, drafts etc.
for more information visit here:
http://www.osttopstapp.com/olm-to-pst.html