DataNumen Exchange Recovery is the best recovery tool for Microsoft Exchange offline storage(.ost) files, supporting Exchange 5.0 to 2013 and Outlook 97 to 2013. It can scan the orphaned or damaged offline storage files(.ost) and recover your emails, folders, posts, appointments, meeting requests, contacts, tasks, journals, notes, etc. in them. Moreover, it can recover deleted items, split oversized OST files, and recover encrypted OST files.