There are two method available for convert OLM to PST first is use manual method and second is use any third party tool. The tool quickly convert Email items, attachment, contact, calendar etc. convert OLM files formats like PST, MBOX, HTML, PDF, MSG, EMLX.
I have a solution to import OLM to PST file format. Fast add multiple OLM files to be converted to PST format. this tool allows us to move multiple OLM files to PST. OLM to PST converter is compatible with all Windows or Outlook versions whether old or new.there are No file size limitations to migrate OLM to PST. It exports emails along with its components like attachments, To, CC, BCC and From. Visit:- http://www.softwaretoconvert.com/olm-to-pst/
Step 1: Download and Run Windows OLM to PST Converter tool.Step 2: Click on Browse and select an OLM file to convert to PST/ MSG/ MBOX/ EML/ PDF.Step 3: Select data items and click on Export to convert OLM file.Setp 4: Select PST format to convert OLM to PST and then click on Export button.