May be meaningful to the conversation ...
Reading through a Paul Thurrott article http://www.windowsitpro.com/article/windows-7/windows-7-enterprise-deployment-143885 he mentioned a company called Browsium who is stating that 80% of large organizations are running XP.
80% is high. Really high. So I went looking to see how valid this Browsium appeared to be.
On their site they mentioned the statistics http://www.browsium.com/2012/07/30/windows7-are-we-half-way-there-yet/
That is where I found the qualifier "Though it's difficult to find hard data on the situation, we estimate...". So the 20/80 needs to be weighted in your mind accordingly.
Without transparent numbers it is really hard to know. I sure hope we are not in the early stages of a technology divide between consumer and business technology. Charles love to use the phrase "general purpose". In a divided world I guess we will need 2 phrases.