The easiest method to fix the Cannot open Outlook data file error is with SysInspire PST Converter software. This software convert outlook pst file into thirteen different-different formats and directly imports pst file into new PST, Gmail, EML, EMLX, vCard, Yahoo, and Office 365. At the time of conversion, it always shows the live preview of every item in Mailbox and you can convert data from a particular date with the help of the Date-Filter feature.