Take best OST file converter tool from Enstella Systems to convert OST PST and open Outlook OST file into PST file. Through OST PST recovery software you can wonderfully recover exchange OST file & export OST to PST/EML/MSG and HTML formats with whole mailbox folders-Inbox, Sent Items, Notes, Task, Draft, Contacts, Calendar & reminder etc. This software split large PST file into small PST from 1GB to 5GB during OST to PST conversions process.