From TechNet blog:
All you need to be eligible for this program – Office 2010 Technology Guarantee – is the following:
- Purchase Office 2007, or a new PC with Office 2007, and activate it between March 5, 2010 and September 30, 2010.
- Have, or create a Windows Live ID.
- Redeem your Tech Guarantee before October 31, 2010 by visiting www.office.com/techg.