[OT] Licensing question

[Richmond Mathewson]

  A friend of mine has just gone and bought a Windows 7 install
disk and is busy installing it on his expensive, bells-n-whistles
PC. He wants to give me his Vista install disk so that I can bung it on
a P4 for testing. As he is upgrading to Win 7 he doesn't feel that
this is a "wicking" thing to do.

Any bright ideas about the legality of his idea?