Not strictly true. Our QA team are using Windows 8 and they typically decided to fire up a VM using built in Hyper-V containing one of the above each :(
No, Windows 8 has IE10 by default. They presumably have that VM to test IE9 and IE7 which are used on previous versions of Windows, but god knows why they put them on Windows 8.
So we now have one extra IE7 and IE9...