The upgrade offer is based on the Office product you purchase and activate. For instance, if you buy Office Home and Student 2010, you can choose between Office 365 Home Premium (one-year non-commercial subscription) or Office Home and Student 2013 (one non-commercial PC license). Check out the below list for more details:

The offer is available in all countries and regions where Microsoft Office is available for purchase. Please note that the new Office 2013 requires Windows 7 or Windows 8 operating system.

So, when you purchase your Office 2010 copy, install and activate it, and then sign for an email reminder (visit Office.com/offer). When the next version of Office is available, you will receive an email from Microsoft containing instructions you need to follow to get the new Office.

Microsoft Office 2013 Free Upgrade

We recommend you visit the official Office upgrade page to know more the free Office upgrade offer.