[zanny]

And the important part is that Microsoft rapidly depreciates updates on old versions of Windows all the time. The adoption of Windows 7 in the poweruser space is probably significantly higher than the adoption in the grandparents category of people still running 2003 - 2004 Dells with XP. Most of them, if unassisted by more tech savvy relatives, would still be running IE 6 - 8, and 9+ won't be backported. Throw Firefox or Chrome on those old PCs and they will stay auto-updated forever.