However, the offer of free upgrade to 2013 pushed me to make this purchase. This advertisement was misleading (at least, the truth is written in very small after following 3 links): Upgrade to Office 2010 family / student 3 positions (and thus 3 users) around 2013 give you access to a license 1 post and one user. So beware the scam.
Having already Office 2007, I decided to do not knowing that I would upgrade 2013. I therefore requested reimbursement.