Mr Moderator, my company still uses XP on about 60 percent of their computers. Most businesses don't jump operating systems that quickly.
At my job, as each computer's lease expires, the new computer (mostly Dell Workstations) are being replaced with new computers with Windows 7 on it.
My firm never went to Visa because it performed so poorly.
I guess your right Windows 7 will be here for at least another 4 to 5 years and most big companies will stick with that for...