I've been asked to audit our software licenses where I work as the Junior Admin, and I've encountered something troubling. About one half of the XP Pro installs that we have are using the same License Number and Key. Yes it is an SLP key. Here is the thing: I am concerned with the legality (or lack thereof) of this practice. Some of the computers in question are Laptops that were down-graded to XP from Vista, some are HP machines, others are IBMs. Most of these machines (save the Laptops) have COA Licenses for XP tacked on the case...but they are not installed with those keys. Please point me in the right direction. I am more then willing to purchase new keys, reinstall/modify the OSs, or anything that is necessary to make our licensing legit (hence the audit :\ ). I would like to know if I need to modify XP so that they are using the provided COA keys or is it acceptable to leave them as is (all using the same the SLP key). The computers are all refurbs that we purchased from the same dealer over the last 5 years. Please advise.