Fix OST to Outlook application management tool is a very good answer for this "How to Fix OST file?" question. This tool is totally developed to convert OST to PST 2003. Outlook OST File Recovery will assist you to recover access to your misplaced offline storage file as the software will make possible OST to PST conversion. OST fix tool supports all Microsoft Exchange servers as 5.0, 5.5, 2003, 2007 and 2010. You can download OST to Outlook software free of cost, after demonstration if you feel satisfied then, you can order to full version of Convert OST Software at just $99 for personal use. For more information: http://www.pstmerge.com/fix-ost-to-outlook.html