If you bought a new computer with Windows 7 between June 2, 2012 and January 31, 2013 then you are entitled to a steeply discounted upgrade to Windows 8. Even if you don't want to upgrade now, you will want to take advantage of Microsoft's offer by the end of the day today. Following today's expiration of the $14.99 upgrade offer, you'll have to pay $120 for the regular edition of Windows 8 and $200 for the Pro version.
Register now and receive in your inbox the invitation to upgrade. Just visit: http://www.windowsupgradeoffer.com/en-US/Home/ProgramInfo.
Though reviews of Windows 8 are somewhat mixed, don't miss out on this discount and regret it later when you have to shell out 10 times as much.