You can't.
You must first create a PST file in "Outlook 97-2002" format while in
Outlook 2003. That's the only PST file you can open in earlier versions.

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Russ Valentine
[MVP-Outlook]
> Please help me:
> How I do for open file by Outlook 2003, to open in Outlook 2002.
> Thanks,
> Luis
Luis Ludenas - 20 Nov 2004 21:31 GMT
I already made it as you taught me
Many Thanks,
Luis
> You can't.
> You must first create a PST file in "Outlook 97-2002" format while in
[quoted text clipped - 3 lines]
>> Thanks,
>> Luis