I googled for Technology Guarantee and some third-party sites seem to still
have the pdf available. But it says you needed to postmark by August 14th,
at least for North American versions. International localized versions may
be on a different timeline, I have no idea.
"Step by Step instructions for ordering your product:
To receive your product, simply complete the order form below and mail it,
along with your proof of purchase and payment, to
the address listed at the end of the order form. This offer is valid for
purchases made from January 6th, 2004 through July 31,
2004. Order most be postmarked by August 14, 2004.
Customer Requirements:
To qualify for this offer you must provide the following proof of purchase
items:
1. Submit a copy of the dated sales receipt for your Microsoft Office v. X
product (verify that it is legible and includes the
retailer/reseller identify information and the purchase date, which must
fall between January 6th, 2004 and July 31, 2004.
2. Submit the Certificate of Authenticity (COA) from the original box top."
Here or here:
http://www.mbsdirect.com/software/office2004/Office2004-Tech-Guarantee-Coupo
www.gradware.com/office-2004-mac.pdf
And the language to search with is:
Microsoft Office 2004 for Mac North America Retail
Technology Guarantee Coupon
DM