The company I have worked for have subscribed to what they call Microsoft Partner Program. And for what I've known, I don't read it, we can install the their OS (XP for us) with the same license key within our company. Am I correct? Employee 1 installed it first. I also installed it and use the same license key used by Employee 1. But Win XP always ask me to activate Windows. When I try to activate it via INTERNET, it says What should I do? What will happen if I don't activate Windows?
You need a corporate key if you want a single key for your company. These keys do not require activation at all.
The Microsoft Partner Program gives you so many copies of each program, depending on which membership you have. Looks like you used them all.