Internet Explorer 10 Drops Vista Support
Found on PC Mag on Friday, 15 April 2011
The next IE won't run on any OS before Windows 7, including Vista.
If users try to install IE10 Platform Preview on a Vista machine, they'll receive an error message and the installer software will shut down.
This is how IE can attain impressive performance on graphics-intensive demos like those on Microsoft's IETestdrive site.
It's just a browser, not the holy grail. Microsoft thinks that users will hand over cash to convert a perfectly running XP machine to Vista instead of just switching to a different browser.