This is from the MS website:
A. The following are required for eligibility.
* Offer valid on qualifying Microsoft Office 2007 products purchased and activated between March 5, 2010, and September 30, 2010.
* The Technology Guarantee upgrade must be requested by October 31, 2010. Requests made after this date will not be accepted.
* This offer is only for customers who purchase new, genuine, qualifying Office 2007 product from Microsoft or an authorized retailer, distributor, OEM or system builder. Ebay sellers or sellers reselling a used product are not authorized retailers.
* This program is not valid for volume license customers, customers with a Not-For-Resale or promotional product, or customers who purchase Office 2007 through the Home Use Rights or Student Select programs.
* Internet access is required. The Technology Guarantee verification and redemption process occurs online. Customers can choose to order physical media for a fee, but this order must be submitted online.
* Customers will be required to confirm the purchase date and have an activated Office 2007 Product Key in order to redeem the Technology Guarantee upgrade. Both the purchase date and the key activation date must be within March 5, 2010 and September 30, 2010. Customers may also be required to provide their Office 2007 dated sales receipt, so customers should keep it until they redeem their upgrade offer.
* Customers are limited to one Office 2010 product for each corresponding qualifying Office 2007 product purchase.
* Customers are limited to 25 Office 2010 Technology Guarantee licenses each.
* The offer applies only to initial purchases or acquisitions of a qualifying Office 2007 product. See full list of the Office 2007 products that qualify for the Technology Guarantee and those that do not qualify.
* There are no refunds or returns for software downloaded or ordered on physical media through the Office 2010 Technology Guarantee program.
* Technology Guarantee upgrade availability varies by language, based on language-specific Office 2010 product release dates. The offer is not available in all languages. See the list of eligible languages.
* The program requires a Windows Live ID.
Check on Ebay and ask them if they are an authorized reseller.
Saw a 3 pack office 2007 for about 165 USD on ebay. Academic Licensing.
