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You may use outdated Office versions, which can lead to further problems.

That is why third-party programs are there for advanced repair beyond the capacity of basic fixes.

You can extract and recover all of your mail items to a PST file using sophisticated OST File to PST Converter software if your OST file becomes unavailable or orphaned.

If you want to rebuild the Outlook profile using Command Line for quick actions or scripting, you can rebuild Outlook profile using Windows Registry Editor and Outlook Command Line.

Although Outlook lets you recreate the file, doing so may result in the loss of any unsynced changes.

The Microsoft Support and Recovery Assistant can automate fixes for common error codes.

There are various methods to resolve the Outlook sync issues, including manual and third-party solutions.