How to Restore Deleted OST Emails - Version 3.7 How to Restore Deleted OST Emails; Use OST Recovery software to restores deleted email with metadata like Subject, To, From, Bcc, Cc etc. If Exchange Server gets down at some time, your email store on Offline Mode as OST files. You want to restore own corrupt or inaccessible OST emails then use Outlook OST Email Recovery software. OST file store in your local system and it keeps record of all file and folder which runs on Exchange Server so you can restore it and also convert them into PST file format after that you access own email perfectly. This software supports all Exchange Server 4.0, 5.0, 5.5, 2000, 2003, 2007 and 2010 as well as MS Outlook version like 97, 98, 2000, XP, 2003, 2007 and 2010. You want to try this software free of cost then download Demo Version from Website, after test of the software you want to buy it then pay only $99 for full version of this software.