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Don’t upset when .ost file corrupted or become inaccessible because here is PDS OST to PST Recovery Software which gives opportunity to resolve all Exchange OST corruption issues including all email properties with attachments/ calendar/ contact/ scheduled task/ notes/ journals and appointments etc. This OST to PST Recovery Software recovers deleted folder items without change in folder hierarchy and after that Recover OST to PST, MSG, EML, PDF, MBOX and HTML formats. It successfully runs on all MS Outlook versions up to 2016.