Outlook 2010 OST to PST Free Converter to convert outlook OST to PST with more usable at the time of OST file size limit issue or appropriate management of MS Outlook PST items. Our Outlook 2010 OST to PST conversion tool is able to convert outlook 2013, 2010, 2007, 2003 OST file and also convert other Outlook versions PST file. OST to PST Free Converter can convert OST to PST/MSG/EML format.