Actually, most corporations have moved to Win7 unless they stopped renewing their EA or support agreements with Microsoft.
XP is no longer provided, supported, or licensed by Microsoft. If you run a corporation on XP workstations and are using newer technologies such as Server 2008/2012, you're going to have a lot of program problems, esp. with 64-bit platforms.
Win8 isn't universally accepted, and there's a lot of doubt in the tech community that it ever will. Touch platforms are not universally accessible or sensible for business.
The multi-national where I work is XP.
Maybe they have extended licensing because of EU rules.
I remember P&G finally switched to Win 95 two years after its introduction.
I thought Microsoft agreed to extend support for XP until sometime in 2014?