I would like to suggest you this Enstella . This is a reliable and safe utility to recover and repair OST data into. This software stores the OST files such as emails, calendars, contacts, events, to-do lists, journals, etc., and recovers the different file formats like PST, EML, MSG, HTML, MHTML, MBOX, RTF, TXT, MS outlook profile, DOC, PDF. It is the best one as it assures you the fastest recovery of your data files. Free availability of demo edition helps you to easily understand application and the complete procedure of recovery.
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