Converting an OST file to a PST file is necessary when you need to access Outlook data without an Exchange server or want to back up your emails locally. Here are the best methods to convert OST to PST:
Method 1: Use Microsoft Outlook’s Built-in Export Feature (If OST is Accessible)
If you can still open the OST file in Outlook (connected to Exchange), follow these steps:
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Open Outlook with the Exchange account.
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Go to File > Open & Export > Import/Export.
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Select Export to a file and click Next.
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Choose Outlook Data File (.pst) and click Next.
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Select the mailbox folders you want to export and choose a destination.
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Click Finish to save as a PST file.
Method 2: Use RecoveryFix OST to PST Converter (Recommended for Corrupt/Orphaned OST Files)
If the OST file is orphaned (no Exchange connection) or corrupted, use a third-party tool like: RecoveryFix OST to PST Converter
Steps:
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Download and install the tool.
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Select the OST file and scan it.
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Preview recoverable emails, contacts, and calendar items.
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Choose Export to PST and save the file.
Method 3: Reconnect OST to Exchange & Export (If Server is Available)
If you still have access to the Exchange server:
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Reconnect Outlook to the Exchange account.
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Let the OST sync with the server.
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Use Method 1 to export to PST.
Method 4: Use Outlook’s Archive Option (Alternative)
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Open Outlook.
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Right-click the mailbox folder > Properties > Advanced.
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Click Outlook Data File (.pst) and set it as the default.
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Drag emails to the new PST folder.
Which Method Should You Choose?
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If OST is accessible → Use Method 1 (Outlook Export).
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If OST is orphaned/corrupt → Use Method 2 (Third-party tool).
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If you have Exchange access → Use Method 3 (Re-sync & Export).
Would you like recommendations for free tools or more details on a specific method?
