How did you create this "backup" and where did you store it?
You should have simply made a copy of your PST file. Exporting and importing
are not a good idea.

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Russ Valentine
[MVP-Outlook]
>I am trying to restore my contacts from a .pst backup file that I had
> previously created. The Import routine fails with the error message that
> 'The
> file D:\backup.pst is not a personal folders file.' Any advice gratefully
> received