You have to create a 2002 compatible PST from within 2003. When you create a
new PST in Outlook 2003 it asks you if you want to create a Microsoft Office
Outlook Personal Folders file or a Outlook 97-2002 Compatible Personal
Folders file. You need to create the second type, then copy your information
from the incompatible PST file to the newly created one.
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Patricia Cardoza
Outlook MVP
Author - Special Edition Using Microsoft Office Outlook 2003
Lead Author - Access 2003 VBA Programmer's Reference
Author - Absolute Beginner's Guide to Microsoft OneNote 2003
http://blogs.officezealot.com/cardoza