Do you mean "register" or "activate"? Activation is required. To
activate Office 2003, start Word or Excel and click on Help | Activate
Product. Registration is optional. The following is what Microsoft
says about registration:
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You do not have to register your Microsoft product. However, when you
register your product, you can receive support, product update
information, a confirmation from Microsoft that you own that product,
and additional benefits. When you register your product, you must submit
some personal information.
To register your product and for help with product registration issues,
visit the following Microsoft Web site:
https://register.microsoft.com/regsys/pic.asp
Microsoft respects your privacy. To review Microsoft's Privacy Policy,
visit the following Microsoft Web site:
http://www.microsoft.com/piracy/basics/activation/apolicy.asp
If you want to be removed from the Microsoft and third-party mailing
list, send a letter with your request to the following address:
Direct Marketing Association, Inc.
11 West 42nd Street
PO Box 3861
New York, NY 10163-3861