OST To PST File Download - Version 3.0 OST file is Offline Storage file of MS Outlook, which is automatically produced when we assemble Configure and create account at the client end, connected to Exchange server. The OST files are same as PST files (Personal Storage Table). OST and PST files, both, are created at same location. PST file is directly synchronized with the network instead of MS Exchange Server and user can read the archived data. So if we want to convert OST file out of Exchange Server environment, we need to convert OST to PST, so that, we can access the mails and documents without connecting to Exchange Server. Extract OST to PST process can be carried out in local system without using any third-party tool. Use our free demo version which can effortlessly convert OST files data into PST files. Now just you have to buy complete version get this just $249.