Windows Home Live officially launched on November 1st, 2005. Windows Home Live was later phased out in August 2012. The services remain the same, but the name itself of "Windows Live" has been taken down.

Yes you can, Windows live is not part of Windows itself. For example Windows xp home addition has nothing to do with Windows live messenger. You can safely remove it without worrying about it affecting windows.

No, but you can get Windows Live Mail for Windows XP in Windows Live Essentials for XP.

The benefits of insulated windows in a home have to do with temperature and noise. If you have insulated windows, you'll spend less on heat or air conditioning, as your windows will let less heat or cold out. Insulated windows also provide a small amount of noise dampening, which can be nice if you live in a noisy place.

Yes,you can run Windows Live Messenger for Windows XP on Windows 7. And all of the other Windows Live Essentials for Windows XP work on Windows 7 without any problems.

So you can install and run all of the Windows Live Essentials for Windows XP on Windows 7 and Windows Vista.

You can get Windows Live Essentials for Windows XP from the Microsoft website.