To convert OLM file to PST file format, I suggest an advance or result-oriented software, you can use Kernel for OLM to PST Converter Tool. This software OLM items such as emails, contacts, notes, calendars etc. to PST format, It can supports the MS Outlook 2013, 2010, 2007 (both 32 and 64 bit versions). To get more details click here : http://www.olmtopstconvert.net/
You can also download free trial demo version : http://www.olmtopsts.net/download.html