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.
Need for performing manual OST to PST conversion occur in case user’s account on MS Exchange Server got accidentally deleted or corrupted, MS Exchange Server downtime, Server crash, database corruption and more etc.
Note: Be assure before performing manual OST to PST conversion process, MS Outlook must be installed on the local computer system connected to MS Exchange Server.
Now follow the steps to Convert OST to PST file manually (I assume we are using MS Office 2003 Professional Edition):
- Open MS Outlook
- Click the File menu.
- Select the “Import and Export” wizard or press ‘t’.
- From the list, click the “Export to a file” option and then click Next button.
- Select Personal File Folder (.pst) and then click Next button.
- Selected items to be exported or Click on parent root and check the Include sub-folders option.
- Browse and select the target folder for saving the email items.
- Click the Finish button.
We perform OST to PST Conversion task manually; it is only be possible when user is connected to MS Exchange Server. And when the user gets disconnected from MS Exchange Server or in case MS Exchange Server got damaged, then you need a third party application to perform OST to PST conversion process.
If the above process did not help you or you are unable to perform such operation, In that case I would recommend user to try the Free Trial version of OST to PST Converter software. In Free version you can repair ost file if it is corrupted and convert ost to pst emails. And recovered or Converted emails you can see in preview items but you cannot saved it. If you are completely satisfied with software capability, you need to purchase the software license.