Last Updated on June 26, 2021
OST file is automatically created when we connected MS Outlook client to MS Exchange Server. OST (.offline storage table) files allow users to work in offline mode, that is, when there is less or no network connectivity available. And when network connection gets connected, OST files get synchronized with the user mailbox on MS Exchange Server. To migrate OST file out of MS Exchange Server environment, manual conversion from OST to PST has to be performed such that all the mail items including Inbox, Outbox, Sent Items, Contacts, Calendar Entries, Tasks, Journals, Posts, Appointments, Drafts, Meeting Requests, and Notes, etc. can be accessed without connecting to MS Exchange Server.
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