Exchange server support OST file into their offline working arena but when you are not in surrounding of Exchange server then open OST extension is big issue for you. To solve this issue you have to try OST2PST converter software which easily open OST extension to PST in just few steps. This easy to use tool open entire OST extension to PST with all folders like OST Inbox, Outbox, Sent Items, Drafts, Junk Folders and Deleted Items etc. OST2PST converter supports entire the advance version of Exchange OST file as well as run perfectly with entire MS Outlook editions. Try freeware application which is free to view OST file items. For complete open OST to PST file you have to buy full version which is available at just $49 only. Get more details here – http://www.ost-2-pst.com/open-ost-extension.html