Microsoft announced a new milestone for Windows 8, which has now reached 60 million licenses sold since it launched last October.The number encompasses both upgrades from Windows 7 and new installations, which also includes license sales to PC and tablet manufacturers which may take the form of bulk orders.In late November Microsoft announced reaching 40 million Windows 8 licenses sold, meaning that around 20 million new licenses were added during December.This puts Windows 8 in line with initial sales for Windows 7, which averaged 19.7 million license sales each month for its first nine months.Unfortunately, Microsoft provided very little context