Yes It does...... if the xbox had a separate memory card(for the 360) you can save your data (NOT on the hardrive on the 360 memory card)
yes xbox games work on xbox360 if you have the hard drive but some of them dont work.
No.
yes
Yes, Xbox games are compatible with the Xbox 360.
depends on the game
No, original Xbox games are not Kinect compatiable.
No , unless you have JTAG on the Xbox
No Xbox games can only work on the platform they were designed for.
yes it can only on xbox 360
Yes
yes
You can play some original Xbox games on the Xbox 360.