This is an unusual question, but hopefully someone can answer it:

I bought two Office 2010 product key cards, 1 Office Professional and 1 Office Home & Student.
The Office Professional was to install on my desktop, the home and student on my laptop that I ordered that will arrive in about two weeks.

When I started installing on my desktop, I used the Office installation tool shipped with the system and entered the product key code. As it began to install, I looked again and realized I'd entered the Home & Student code instead of Professional. I hit the cancel button while it was installing, and it did not complete installing. After that I installed Professional.

What I'm wondering is whether this Home and Student code, since the installation did not complete, can be used on my laptop once it arrives. Basically, does Microsoft permanently activate the software once you enter the key code or once the installation completes?

Anybody have an answer to this? I'd really hate to have lost $119 to this stupid mistake.