How to Solve OST Corruption Issues & Convert OST to PST File? In the universe there are several users who using the OST File for maintaining the Exchange Server user mailboxes data. This file gives the permission to users to access its storage data in the absent of Exchange Server Network Connectivity. OST File compress users emails, contacts, calendars, task, notes, incoming items, outgoing items and other items. OST file corruption Leads to Various Error Messages as Given Below:    Internal error of OST file (error code=0000000E) Error 8004011D-526-80040115-0 Service-specific error 0 (0×0) Error code 0x8004103b OST Internal error (error code=00000003) Error-message/c5e20916-9359-43fc-9bd9 Service-specific error 0 (0×0)   # You Can Learn The Working Process of OST to PST Converter Software By Above video. The messages filtering option is best that permits to filter the emails per folder emails according to dates for recovery.