How to use OST File - Version 3.3 How to use OST File? After conversion of OST to PST, Outlook User can use OST file in form of PST file. When Outlook user lost email due to crash or down of Exchange Server but on Exchange Server replica of emails store as OST files. You want to restore own email because important for business or other purpose then applies OST to PST Converter Software and easily get emails from OST files as PST file format. Successfully runs on all Windows Operating System version such as Windows 7/Windows Vista / 2003 / 2000 / XP and supports all Outlook Version like 97, 98, 2000, XP, 2003, 2007 and 2010 as well as converts inaccessible OST to Personal folder File (PST) with OST Recovery Software. You can test this tool by demo version which is free of cost later than demonstration you want to purchase full version then invest only $99. Download this software and purchase online visit-: http://www.convertostpst.org/