OST files or Offline Folders which are kept on user's system are a duplicate copy of user's Exchange Mailbox. Each and every OST file is linked with a particular Exchange mailbox which cannot be used with any other mailbox. Hence a user cannot use the same OST file with a new mailbox after migrating to another Exchange Server. Although, administrators maintain offline folder files at the time of migration by keeping the mailboxes of remote user at a different place.
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