planetearth

My friend got an excellent deal on the FULL Vista Business CD when CompUSA
was going out of sale. Since then, he bought a new Dell laptop with Vista
Home Premium on it, and just wants to *upgrade* to Vista Business.
He does NOT want to wipe Home Premium to replace it with Business, since the
laptop has all the drivers and MS Works (which he wants to upgrade to Office
Standard 2007 using the "upgrade" version).
Can he use the full version of Vista Business to just upgrade Vista Home
premium? As I recall, this wasn't always an option with older versions of
Windows: if you had the "full" version on CD, you couldn't upgrade from it;
you could only wipe and replace.
Thanks!

Steve