I recently bought a new laptop, as my old one was slowly dying. When I reinstalled my Office 2007 (Using the original cd and key), the product activation step failed. It said that I had exceeded the amount of installations on different Pcs.
Two months ago, my motherboard burned on my pc, so I had it fixed and had to reinstall everything on the computer. Now, I bought a new laptop so i'm guessing Microsoft counts that as being 4 different computers (two pcs and two laptops)?