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.
Yes, if you purchase Microsoft Office 2010, it will be compatible with Windows XP. If you get the newer version like Microsoft Office 2013, it will not be compatible with Windows XP.
sometimes it works well with windows XP
yes, from windows XP to windows 7, but only windows!
no
http://www.apple.com/itunes/download/ Then just click: "Windows Xp or Vista" and give them your email address
Yes.
The first Fable game for the PC is compatible with Windows XP. It says so in the system requirements.
It is compatible with windows xp,so yes.
Yes
Do you mean the games say "compatible with windows 98?" and you have Windows XP? Games are backwards compatible. Meaning, if the games say "windows 98", windows 95 is ok (anything before windows 98 will work). But it is not forward compatible--Windows 2000, windows xp, etc. will not work. does this answer?