What are you looking for? There is a help file accessible from Outlook 2003.
There's no free "guide" although there are websites like
www.slipstick.com
and numerous books on Outlook 2003.
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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