Vista tops out at 9. You may or may not care.
Locking browser upgrades to OS upgrades without huge a technical justification. With XP maybe there was a case that it was too hard to support all the changes needed but Vista to Windows 7/8? This was a business decision not a technical one.
At least Vista uptake was relatively small.
There is 0 technical justification, just some exec decision. Thanks to that and crappy XP security (by design , there is no other word), you have these huge botnets that will be here for years.
Companies need to understand that XP , and IE on XP is a threat to their business, their data and using Microsoft products will damage them sooner or later, and i'm not even talking about MSFT racketeering ,sorry license policy.
StatCounter[1]: XP 20.58%, Vista 5.21%
Among gamers, XP and Vista are about equally unpopular.
Steam[2]: XP32 6.83%, XP64 0.35%, Vista32 5.18, Vista64 2.32%