I refreshed my windows 8 and lost my office professional 2007. It worked before but I was having a problem with adobe and refreshed my computer and it took it off with several other programs, this is the only product that said I have an incorrect product key...no I don't it's in front of me and it was working great this morning with outlook.
Contact ms, but they may not provide the support for this situation immediately.
They may ask you to purchase a new one, but the price is very high, isn't it?
I met the problem before. considering their service, i gave up.
I just bought a new one from go2keys.com after comparing several sites on yahoo, as their price attracted me.
Guess what happens, it worked successfully. hope my experience is helpful to you.