My product key won’t activate outlook although it activated everything else earlier today

I purchased 2011 office for mac today and after installing it i tried to add my email account to outlook and it said i needed to activate outlook first and asked for my product key so i put the key in that had just worked fine with everything else and it is saying that the product key is wrong and won't let me activate outlook. any help would be greatly appreciated as i just bought the macbook today and have no idea what I'm doing. was going to uninstall then reinstall but i have no idea how to do it.