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All customers who purchase and activate the license within the specify period will have a right to upgrade to a new Microsoft Office 2010 for free.

Program period: Staring from 5 March 2010 to 30 September 2010 (Must purchase and activate within this period)
Product Generally Available Date: June 2010
Upgrade Period: After the Generally Available date to 31 October 2010

Edition that eligible for upgrading

Office Home and Student 2007 -> Office Home and Student 2010
Office Basic 2007 -> Office Home and Business 2010
Office Small Business 2007 -> Office Professional 2010
Office Professional 2007 -> Office Professional 2010