I purchased what I thought was an individual license. Believing this, I felt no need to install it right away. When I installed it and tried to unsuccessfully register it, I learned I was sold one license of 500 of a corporate version. I called Microsoft due to this and was told that all of the 500 licenses were registered already. In other words, they oversold the licenses, which, to me, seems fraudulent. I purchased it on eBay and do not know if a company can sell their licenses that way.