To convert OST to PST free, download the free trial version of Recoveryfix for OST to PST software. It allows you to recover and preview all Outlook emails and other mailbox items from corrupt or inaccessible OST files. However, you cannot save the recovered OST files using trial version. For that, you need to purchase software’s licensed version. The software supports all versions of Outlook. www.convert.osttopstfree.org