A further thought
MS have a strange attitude to intellectual property. Years ago one of my kids bought an MS game. Somehow between purchase and installation the CD Rom got damaged. When we called them they refused to help even if we provided the receipt and the damaged disc. (And presumably they could check that the key had not been used.) We made all the arguments regarding licensing and intellectual property etc but to no avail. However they were unfortunate in the wronged kid. After several days of his phone calls and keeping a senior VP on the phone for an hour or two and a recorded delivery letter to Mr Gates home they sent him a new disc.