This software available on internet in huge numbers but i want to recommend you to use this professional OST to PST converter software which can easily export single or multiple OST data into PST format in just single way. It allows user to export OST file into different formats such as: - PST, EML, MSG, HTML, MBOX and PDF with email properties- To, Cc, Bcc, Date, Time and Subject.
Technical or non technical both can easily use this software without any technical skill and provide an enhanced and interactive easy to use user friendly interface to make this process fast and smooth. The message filtering option helps to search emails between two selective dates as “start date to end date”. This program supports all windows versions upto 10 (32 and 64 bit).
Read More info:- http://www.pcrecoverytools.com/convert-ost-to-pst.html