However, recovering data from OST file simply by accessing it is not possible. OST file is devised with a security, owing to which a user cannot access OST contents simply by Windows NT login. For accessing data of OST file, you need to convert OST to PST. OST to PST converter ensures that a user can access data in Outlook environment.
OST to PST converter tool is able to recover emails from OST files that were lost due to virus attacks, header corruptions or database corruptions. In addition to this, OST to PST converter can be used in the event of 2GB limitation error i.e. for previous versions of OST files created using Exchange Server (2002 and previous ones). Using OST repair tool, you can easily convert emails, folders, attachments, notes, journals, appointments and tasks which can be saved in PST file at the desired location.
OST to PST conversion software scans the OST file recursively and displays preview of mailbox emails so recovered. The selected data is then saved in PST file format so that the user can access the same using MS Outlook. Using this OST repair tool, you can save the recovered emails in PST, EML or MSG format. Owing to these available options, a user can access emails with the desired email client. OST to PST conversion software supports conversion of OST files created using MS Exchange Server versions 5.0, 5.5, 2000, 2003, 2007 and 2010.
Microsoft Exchange Server- 2010, 2007, 2003, 2000, 5.5 and 5.0 MS
Outlook - 2010, 2007, 2003, 2002, 2000, 98 and 97
Outlook Express - 6.0, 5.5, 5.0 and 4.0

Offline folder files or OST files are used extensively by users due to the flexibility these files offer and that is allowing a user to work offline or in absence of Server. OST files are also termed as slave replicas of Exchange Server mailboxes and therefore, OST files hold utmost importance in an Exchange Server environment. After accidental deletion of Exchange mailboxes, database corruption, Exchange Server crash and similar issues, your email data becomes inaccessible. This is the time when you can make use of your OST file and recover your data. 