Microsoft is desperate to push people to upgrade, because the value of a new version is non-obvious to most and the normal upgrade path is getting a new PC. The

Microsoft is desperate to push people to upgrade, because the value of a new version is non-obvious to most and the normal upgrade path is getting a new PC. They are making a choice to do something that is worse for them in some ways because having people using the newer versions is very important to them (as proven by them flat-out giving away 10).