If user cannot access mailbox on Exchange server due to some issues like MS Exchange server failure ,virus attacks, bad sectors, Trojan infections,data exploitation ,system shutdown etc.Then OST to PST converter application came in existence and User recover whole data which are deleted and convert OST Files to PST files .offline storage table files are the copy of user mailbox on Microsoft exchange server when software converted OST files to PST files there are no modification and alteration appear in original data. This software is being used in market with massive features like OST to MSG file conversion, OST to EML conversion. In order to check and convert OST to PST files completely then demo version will not work because it shows only the preview of recovered e-mails but does not provide the authority saving them into different types of format like OST to PST, OST to EML, OST to MSG .If user wants the full access of convert OST to PST tool then pay $99. For more info-: http://www.convert-ost.com/