Compact OST File - Version 10.10.01 OST file is the offline storage file of the Exchangeserver. It may become unusable due to Exchange servercrash, mailbox deletion or user account deletion fromActive from Active Directory. In such situations, whereOST file becomes unusable, using OST file tool can helpthe user to access its email data with MS Outlook byperforming OST to PST conversion. OST file tool recoverall available email items including mail messages,folders, posts, appointments, contacts, tasks, meetingrequests, distribution lists, task requests, journalsand notes. Once all items are recovered OST file toolprovides the user with four options i.e. PST, DBX, EMLand MSG to save recovered email items. To convert OSTfile to PST, OST file tool supports MS Exchange 5.0,5.5, 2000, 2003, 2007 and 2010, MS Outlook 97, 98,2000, 2003, 2007 and 2010 and Outlook Express 4.0, 5.0,5.5 and 6.0. Free demo version of OST file tool is alsoavailable, which enables users to experience softwarefunctioning before making actual purchase. The demoversion extracts email items from unusable OST file anddisplays preview of them. However, to save theseextracted email items, full version needs to be purchased.