OST stands for offline storage table (.ost) and PST for Personal Storage Table (.pst) OST file is created by MS Exchange server where saved local copy of your emails and PST is MS Outlook files its save your all outlook emails data on your windows system such as Inbox, Outbox, Sent Items, Deleted Items, Draft, Journals, Tasks, Calendar, Notes, Contacts etc in the Exchange server. If you are interested to know more about OST to PST search on Google Kernel for OST to PST, also you can visit here:- http://www.ostpst.org
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