They are "compatible" in the sense that many applications that run on Windows XP will run on Windows Vista.
Yes, Windows Live Messenger 2009 is XP, Vista and 7 compatible.
Drivers written for Windows Vista are not backwards-compatible with Windows XP. Most hardware that has a driver for Vista should also have a driver for Windows XP.
Yes. It's compatible with Win7/XP/Vista.
No, it's compatible with Windows XP, or Vista/Vista64.
Yes, it is compatible with Windows 7, Vista and XP.
yes it can work on Windows Vista and XP Service Pack 2
No. The Nintendo Wii is not compatible with Windows.
Vista is just a version of Windows; the version after Windows XP and before Windows 7. If a machine is Vista-ready or Vista-compatible, it just means that the hardware and available drivers are compatible with Windows Vista. You might be able to run that PC on Windows 7 or 8, but it depends, and you would have to check with the manufacturer to find out what all it is compatible with.
i have found its compatible with everything i used with vista / xp, it should work with almost everything.
It requires less resources and it's more compatible with hardware.
It depends on which version. 4 and 5 versions are compatible with vista.
No. Obviously, if you upgrade to Windows Vista, you will have Windows Vista.