OST File Conversion Freeware - Version 3.5 OST File Conversion Freeware Software to convert OST to OST Outlook 2010, 2007, 2003 and convert OST to MSG and Convert OST to EML - dual functionality. OST file conversion freeware manages all fields of OST while it converts OST to PST and OST to MSG & EML. Outlook OST file conversion tool can convert all fields of Exchange OST emails like to, from, cc, inline images, priority, subject, HTML etc. This Free OST file conversion tool also provides you the functionality to save the OST file in PST. You can purchase the OST file converter software in just $99 for personal license and can convert all OST items to PST conveniently. For any convenience, you can first try the trial version which can convert OST to PST easily. If you found any problem any time, you can also contact to our 24*7 online tech support and get the solution.