Microsoft offers a future Microsoft Office upgrade for free with the purchase and activation of a qualifying current Office product. Your upgrade eligibility will depend on the version of Office you buy. (For example, if you purchase Office Home and Student 2010, you can upgrade to Office 365 Home Premium or Office Home and Student 2013.) That's the first such Office upgrade offer we've seen from Microsoft. For more information, click here. Deal ends April 30; you must redeem the upgrade by May 31.