In a bid to lure existing Windows users to Windows 8, Microsoft has announced a special introductory upgrade offer for those who choose to upgrade from Windows XP, Windows Vista, or Windows 7 between October 26, 2012 and January 31, 2013. As part of this offer, they will have to pay just $39.99 for a downloadable version of Windows 8 Pro and $69.99 for its boxed counterpart . But Microsoft has reserved the best deal for those who purchase a Windows 7 PC between July 2, 2012 and January 31, 2013 by making them eligible for a $14.99 Windows 8 Pro upgrade. Such deals are all fine and dandy, but surely not everyone is going to upgrade in the first three months. So what about those who choose to upgrade after the promo period? And, more importantly, what about full (non-upgrade) pricing?