I need some advice here. I am going to buy Microsoft Office 2007 Pro edition. I want to know that how many times I can activate the product. In last here I had almost changed my system 4 times. Now if I go with the new edition of Office there are chances that I will activate that many times. Is there a limitation for that. I am not trying to use the same key on different computer. I am just trying to activate it again incase if I change my system.